diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..fa2b920
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,8 @@
+language: node_js
+node_js:
+  - "6"
+  - "7"
+  - "8"
+  - "9"
+script:
+  - npm test
diff --git a/bin/mkdoc.js b/bin/mkdoc.js
index 97881f6..97a5b86 100644
--- a/bin/mkdoc.js
+++ b/bin/mkdoc.js
@@ -1,17 +1,21 @@
-var dox = require('dox'),
-    fs = require('fs'),
-    code = fs.readFileSync(__dirname + '/../index.js').toString('utf8'),
-    ast = dox.parseComments(code, {raw: true}),
-    apiDoc = dox.api(ast),
-    tpl, readme;
+'use strict';
+
+const dox = require('dox');
+const fs = require('fs');
+
+const code = fs.readFileSync(__dirname + '/../index.js').toString('utf8');
+const ast = dox.parseComments(code, { raw: true });
+
+let apiDoc = dox.api(ast);
 
 // Don't like the new format Do.method
 apiDoc = apiDoc
     .replace(/Do\./g, 'Do#')
     .replace('##', '###')
     .trim();
-tpl = fs.readFileSync(__dirname + '/readme.tpl', 'utf8');
-readme = tpl.replace('{api}', apiDoc);
+
+const tpl = fs.readFileSync(__dirname + '/readme.tpl', 'utf8');
+const readme = tpl.replace('{api}', apiDoc);
 fs.writeFileSync(__dirname + '/../readme.md', readme);
 
 console.log('Written readme.md');
diff --git a/do.js b/do.js
index 7fb58f5..8f9c9e1 100644
--- a/do.js
+++ b/do.js
@@ -49,7 +49,7 @@ Do.prototype.errors;
  * @api public
  */
 Do.prototype.amount = function(value) {
-  if (value !== null) {
+  if (typeof(value) === 'number') {
     this._amount = value;
     return this;
   }
diff --git a/package-lock.json b/package-lock.json
index c390444..cb14191 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "do",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -63,6 +63,16 @@
       "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
       "dev": true
     },
+    "anymatch": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-1.3.2.tgz",
+      "integrity": "sha512-0XNayC8lTHQ2OI8aljNCN3sSx6hsr/1+rlcDAotXJR7C1oZZHCNsfpbKwMjRA3Uqb5tF1Rae2oloTr4xpq+WjA==",
+      "dev": true,
+      "requires": {
+        "micromatch": "2.3.11",
+        "normalize-path": "2.1.1"
+      }
+    },
     "argparse": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
@@ -72,10 +82,19 @@
         "sprintf-js": "1.0.3"
       }
     },
-    "argsparser": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/argsparser/-/argsparser-0.0.6.tgz",
-      "integrity": "sha1-/0XrW5LABCJc8UalHTOdzLJlvmM=",
+    "arr-diff": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz",
+      "integrity": "sha1-jzuCf5Vai9ZpaX5KQlasPOrjVs8=",
+      "dev": true,
+      "requires": {
+        "arr-flatten": "1.1.0"
+      }
+    },
+    "arr-flatten": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
+      "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
       "dev": true
     },
     "array-union": {
@@ -93,6 +112,12 @@
       "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
       "dev": true
     },
+    "array-unique": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.2.1.tgz",
+      "integrity": "sha1-odl8yvy8JiXMcPrc6zalDFiwGlM=",
+      "dev": true
+    },
     "arrify": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
@@ -111,6 +136,12 @@
       "integrity": "sha1-104bh+ev/A24qttwIfP+SBAasjQ=",
       "dev": true
     },
+    "async-each": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.1.tgz",
+      "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
+      "dev": true
+    },
     "asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -180,6 +211,12 @@
         "tweetnacl": "0.14.5"
       }
     },
+    "binary-extensions": {
+      "version": "1.11.0",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.11.0.tgz",
+      "integrity": "sha1-RqoXUftqL5PuXmibsQh9SxTGwgU=",
+      "dev": true
+    },
     "bind-obj-methods": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/bind-obj-methods/-/bind-obj-methods-1.0.0.tgz",
@@ -211,25 +248,15 @@
         "concat-map": "0.0.1"
       }
     },
-    "bunker": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/bunker/-/bunker-0.1.2.tgz",
-      "integrity": "sha1-yImSRkqOKm7ehpMDdfkrWAd++Xw=",
+    "braces": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/braces/-/braces-1.8.5.tgz",
+      "integrity": "sha1-uneWLhLf+WnWt2cR6RS3N4V79qc=",
       "dev": true,
-      "optional": true,
       "requires": {
-        "burrito": "0.2.12"
-      }
-    },
-    "burrito": {
-      "version": "0.2.12",
-      "resolved": "https://registry.npmjs.org/burrito/-/burrito-0.2.12.tgz",
-      "integrity": "sha1-0NbmrIHV6ZeJxvpKzLCwAx6lT2s=",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "traverse": "0.5.2",
-        "uglify-js": "1.1.1"
+        "expand-range": "1.8.2",
+        "preserve": "0.2.0",
+        "repeat-element": "1.1.2"
       }
     },
     "caller-path": {
@@ -290,6 +317,22 @@
       "integrity": "sha1-tUc7M9yXxCTl2Y3IfVXU2KKci/I=",
       "dev": true
     },
+    "chokidar": {
+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-1.6.1.tgz",
+      "integrity": "sha1-L0RHq16W5Q+z14n9kNTHLg5McMI=",
+      "dev": true,
+      "requires": {
+        "anymatch": "1.3.2",
+        "async-each": "1.0.1",
+        "glob-parent": "2.0.0",
+        "inherits": "2.0.3",
+        "is-binary-path": "1.0.1",
+        "is-glob": "2.0.1",
+        "path-is-absolute": "1.0.1",
+        "readdirp": "2.1.0"
+      }
+    },
     "circular-json": {
       "version": "0.3.3",
       "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.3.tgz",
@@ -311,15 +354,6 @@
         "restore-cursor": "2.0.0"
       }
     },
-    "cli-table": {
-      "version": "0.0.2",
-      "resolved": "https://registry.npmjs.org/cli-table/-/cli-table-0.0.2.tgz",
-      "integrity": "sha1-mChn4WQ1Mlxmwgih5xuVM26jCTs=",
-      "dev": true,
-      "requires": {
-        "colors": "0.3.0"
-      }
-    },
     "cli-width": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
@@ -353,12 +387,6 @@
       "integrity": "sha512-qiBjkpbMLO/HL68y+lh4q0/O1MZFj2RX6X/KmMa3+gJD3z+WwI1ZzDHysvqHGS3mP6mznPckpXmw1nI9cJjyRg==",
       "dev": true
     },
-    "colors": {
-      "version": "0.3.0",
-      "resolved": "https://registry.npmjs.org/colors/-/colors-0.3.0.tgz",
-      "integrity": "sha1-wkfWTTTbDKTcjkPz7NbamNCvlOc=",
-      "dev": true
-    },
     "combined-stream": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.5.tgz",
@@ -369,10 +397,13 @@
       }
     },
     "commander": {
-      "version": "0.6.1",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-0.6.1.tgz",
-      "integrity": "sha1-+mihT2qUXVTbvlDYzbMyDp47GgY=",
-      "dev": true
+      "version": "2.9.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.9.0.tgz",
+      "integrity": "sha1-nJkJQXbhIkDLItbFFGCYQA/g99Q=",
+      "dev": true,
+      "requires": {
+        "graceful-readlink": "1.0.1"
+      }
     },
     "concat-map": {
       "version": "0.0.1",
@@ -507,6 +538,15 @@
       "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
       "dev": true
     },
+    "detect-file": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/detect-file/-/detect-file-0.1.0.tgz",
+      "integrity": "sha1-STXe39lIhkjgBrASlWbpOGcR6mM=",
+      "dev": true,
+      "requires": {
+        "fs-exists-sync": "0.1.0"
+      }
+    },
     "diff": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/diff/-/diff-1.4.0.tgz",
@@ -523,13 +563,14 @@
       }
     },
     "dox": {
-      "version": "0.4.2",
-      "resolved": "https://registry.npmjs.org/dox/-/dox-0.4.2.tgz",
-      "integrity": "sha1-PvYZPivlwijZEr60zd2IpN5k6/s=",
+      "version": "0.9.0",
+      "resolved": "https://registry.npmjs.org/dox/-/dox-0.9.0.tgz",
+      "integrity": "sha1-vpewhcufSgt+gINdVH53uGh9Cgw=",
       "dev": true,
       "requires": {
-        "commander": "0.6.1",
-        "github-flavored-markdown": "1.0.1"
+        "commander": "2.9.0",
+        "jsdoctypeparser": "1.2.0",
+        "markdown-it": "7.0.1"
       }
     },
     "ecc-jsbn": {
@@ -542,6 +583,18 @@
         "jsbn": "0.1.1"
       }
     },
+    "ensure-posix-path": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/ensure-posix-path/-/ensure-posix-path-1.0.2.tgz",
+      "integrity": "sha1-pls+QtC3HPxYXrd0+ZQ8jZuRsMI=",
+      "dev": true
+    },
+    "entities": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-1.1.1.tgz",
+      "integrity": "sha1-blwtClYhtdra7O+AuQ7ftc13cvA=",
+      "dev": true
+    },
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
@@ -656,6 +709,39 @@
       "integrity": "sha1-LUH1Y+H+QA7Uli/hpNXGp1Od9/Y=",
       "dev": true
     },
+    "exists-stat": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/exists-stat/-/exists-stat-1.0.0.tgz",
+      "integrity": "sha1-BmDjUlouidnkRhKUQMJy7foktSk=",
+      "dev": true
+    },
+    "expand-brackets": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/expand-brackets/-/expand-brackets-0.1.5.tgz",
+      "integrity": "sha1-3wcoTjQqgHzXM6xa9yQR5YHRF3s=",
+      "dev": true,
+      "requires": {
+        "is-posix-bracket": "0.1.1"
+      }
+    },
+    "expand-range": {
+      "version": "1.8.2",
+      "resolved": "https://registry.npmjs.org/expand-range/-/expand-range-1.8.2.tgz",
+      "integrity": "sha1-opnv/TNf4nIeuujiV+x5ZE/IUzc=",
+      "dev": true,
+      "requires": {
+        "fill-range": "2.2.3"
+      }
+    },
+    "expand-tilde": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/expand-tilde/-/expand-tilde-1.2.2.tgz",
+      "integrity": "sha1-C4HrqJflo9MdHD0QL48BRB5VlEk=",
+      "dev": true,
+      "requires": {
+        "os-homedir": "1.0.2"
+      }
+    },
     "extend": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.1.tgz",
@@ -673,6 +759,15 @@
         "tmp": "0.0.33"
       }
     },
+    "extglob": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/extglob/-/extglob-0.3.2.tgz",
+      "integrity": "sha1-Lhj/PS9JqydlzskCPwEdqo2DSaE=",
+      "dev": true,
+      "requires": {
+        "is-extglob": "1.0.0"
+      }
+    },
     "extsprintf": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/extsprintf/-/extsprintf-1.3.0.tgz",
@@ -716,6 +811,37 @@
         "object-assign": "4.1.1"
       }
     },
+    "filename-regex": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/filename-regex/-/filename-regex-2.0.1.tgz",
+      "integrity": "sha1-wcS5vuPglyXdsQa3XB4wH+LxiyY=",
+      "dev": true
+    },
+    "fill-range": {
+      "version": "2.2.3",
+      "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-2.2.3.tgz",
+      "integrity": "sha1-ULd9/X5Gm8dJJHCWNpn+eoSFpyM=",
+      "dev": true,
+      "requires": {
+        "is-number": "2.1.0",
+        "isobject": "2.1.0",
+        "randomatic": "1.1.7",
+        "repeat-element": "1.1.2",
+        "repeat-string": "1.6.1"
+      }
+    },
+    "findup-sync": {
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/findup-sync/-/findup-sync-0.4.3.tgz",
+      "integrity": "sha1-QAQ5Kee8YK3wt/SCfExudaDeyhI=",
+      "dev": true,
+      "requires": {
+        "detect-file": "0.1.0",
+        "is-glob": "2.0.1",
+        "micromatch": "2.3.11",
+        "resolve-dir": "0.1.1"
+      }
+    },
     "flat-cache": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-1.3.0.tgz",
@@ -728,6 +854,21 @@
         "write": "0.2.1"
       }
     },
+    "for-in": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/for-in/-/for-in-1.0.2.tgz",
+      "integrity": "sha1-gQaNKVqBQuwKxybG4iAMMPttXoA=",
+      "dev": true
+    },
+    "for-own": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/for-own/-/for-own-0.1.5.tgz",
+      "integrity": "sha1-UmXGgaTylNq78XyVCbZ2OqhFEM4=",
+      "dev": true,
+      "requires": {
+        "for-in": "1.0.2"
+      }
+    },
     "foreground-child": {
       "version": "1.5.6",
       "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-1.5.6.tgz",
@@ -773,6 +914,12 @@
       "integrity": "sha1-zyVVTKBQ3EmuZla0HeQiWJidy84=",
       "dev": true
     },
+    "fs-exists-sync": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/fs-exists-sync/-/fs-exists-sync-0.1.0.tgz",
+      "integrity": "sha1-mC1ok6+RjnLQjeyehnP/K1qNat0=",
+      "dev": true
+    },
     "fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
@@ -823,12 +970,6 @@
         }
       }
     },
-    "github-flavored-markdown": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/github-flavored-markdown/-/github-flavored-markdown-1.0.1.tgz",
-      "integrity": "sha1-kzYbh6McJXkNnIGht5ghSnN+qzg=",
-      "dev": true
-    },
     "glob": {
       "version": "7.1.2",
       "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
@@ -843,6 +984,47 @@
         "path-is-absolute": "1.0.1"
       }
     },
+    "glob-base": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/glob-base/-/glob-base-0.3.0.tgz",
+      "integrity": "sha1-27Fk9iIbHAscz4Kuoyi0l98Oo8Q=",
+      "dev": true,
+      "requires": {
+        "glob-parent": "2.0.0",
+        "is-glob": "2.0.1"
+      }
+    },
+    "glob-parent": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-2.0.0.tgz",
+      "integrity": "sha1-gTg9ctsFT8zPUzbaqQLxgvbtuyg=",
+      "dev": true,
+      "requires": {
+        "is-glob": "2.0.1"
+      }
+    },
+    "global-modules": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/global-modules/-/global-modules-0.2.3.tgz",
+      "integrity": "sha1-6lo77ULG1s6ZWk+KEmm12uIjgo0=",
+      "dev": true,
+      "requires": {
+        "global-prefix": "0.1.5",
+        "is-windows": "0.2.0"
+      }
+    },
+    "global-prefix": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/global-prefix/-/global-prefix-0.1.5.tgz",
+      "integrity": "sha1-jTvGuNo8qBEqFg2NSW/wRiv+948=",
+      "dev": true,
+      "requires": {
+        "homedir-polyfill": "1.0.1",
+        "ini": "1.3.5",
+        "is-windows": "0.2.0",
+        "which": "1.3.0"
+      }
+    },
     "globals": {
       "version": "11.1.0",
       "resolved": "https://registry.npmjs.org/globals/-/globals-11.1.0.tgz",
@@ -869,6 +1051,12 @@
       "integrity": "sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg=",
       "dev": true
     },
+    "graceful-readlink": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/graceful-readlink/-/graceful-readlink-1.0.1.tgz",
+      "integrity": "sha1-TK+tdrxi8C+gObL5Tpo906ORpyU=",
+      "dev": true
+    },
     "har-validator": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/har-validator/-/har-validator-2.0.6.tgz",
@@ -876,7 +1064,7 @@
       "dev": true,
       "requires": {
         "chalk": "1.1.3",
-        "commander": "2.12.2",
+        "commander": "2.9.0",
         "is-my-json-valid": "2.16.1",
         "pinkie-promise": "2.0.1"
       },
@@ -894,12 +1082,6 @@
             "supports-color": "2.0.0"
           }
         },
-        "commander": {
-          "version": "2.12.2",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.12.2.tgz",
-          "integrity": "sha512-BFnaq5ZOGcDN7FlrtBT4xxkgIToalIIxwjxLWVJ8bGTpe1LroqMiqQXdA7ygc7CRvaYS+9zfPGFnJqFSayx+AA==",
-          "dev": true
-        },
         "strip-ansi": {
           "version": "3.0.1",
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
@@ -944,6 +1126,15 @@
       "integrity": "sha1-ILt0A9POo5jpHcRxCo/xuCdKJe0=",
       "dev": true
     },
+    "homedir-polyfill": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/homedir-polyfill/-/homedir-polyfill-1.0.1.tgz",
+      "integrity": "sha1-TCu8inWJmP7r9e1oWA921GdotLw=",
+      "dev": true,
+      "requires": {
+        "parse-passwd": "1.0.0"
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       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-1.0.1.tgz",
@@ -3142,6 +3683,12 @@
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       "dev": true
     },
+    "set-immediate-shim": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/set-immediate-shim/-/set-immediate-shim-1.0.1.tgz",
+      "integrity": "sha1-SysbJ+uAip+NzEgaWOXlb1mfP2E=",
+      "dev": true
+    },
     "shebang-command": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
@@ -3301,9 +3848,9 @@
       }
     },
     "tap": {
-      "version": "10.7.3",
-      "resolved": "https://registry.npmjs.org/tap/-/tap-10.7.3.tgz",
-      "integrity": "sha512-oS/FIq+tcmxVgYn5usKtLsX+sOHNEj+G7JIQE9SBjO5mVYB1rbaEJJiDbnYp8k0ZqY2Pe4HbYEpkvzm9jfLDyw==",
+      "version": "11.0.0",
+      "resolved": "https://registry.npmjs.org/tap/-/tap-11.0.0.tgz",
+      "integrity": "sha512-Zi0jvdyN/2o2BgK3oKyApmyt/taAcGiChnXJtoEpOKiU/99+NwWJCyvVBRdQ3+30yFz5TE/ImVX3/GqDvndZ3g==",
       "dev": true,
       "requires": {
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@@ -3317,20 +3864,23 @@
         "glob": "7.1.2",
         "isexe": "2.0.0",
         "js-yaml": "3.10.0",
+        "minipass": "2.2.1",
+        "mkdirp": "0.5.1",
         "nyc": "11.3.0",
         "opener": "1.4.3",
         "os-homedir": "1.0.2",
         "own-or": "1.0.0",
         "own-or-env": "1.0.0",
-        "readable-stream": "2.3.3",
+        "rimraf": "2.6.2",
         "signal-exit": "3.0.2",
         "source-map-support": "0.4.18",
         "stack-utils": "1.0.1",
         "tap-mocha-reporter": "3.0.6",
-        "tap-parser": "5.4.0",
+        "tap-parser": "7.0.0",
         "tmatch": "3.1.0",
         "trivial-deferred": "1.0.1",
         "tsame": "1.1.2",
+        "write-file-atomic": "2.3.0",
         "yapool": "1.0.0"
       }
     },
@@ -3359,18 +3909,29 @@
           "requires": {
             "ms": "2.0.0"
           }
+        },
+        "tap-parser": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/tap-parser/-/tap-parser-5.4.0.tgz",
+          "integrity": "sha512-BIsIaGqv7uTQgTW1KLTMNPSEQf4zDDPgYOBRdgOfuB+JFOLRBfEu6cLa/KvMvmqggu1FKXDfitjLwsq4827RvA==",
+          "dev": true,
+          "requires": {
+            "events-to-array": "1.1.2",
+            "js-yaml": "3.10.0",
+            "readable-stream": "2.3.3"
+          }
         }
       }
     },
     "tap-parser": {
-      "version": "5.4.0",
-      "resolved": "https://registry.npmjs.org/tap-parser/-/tap-parser-5.4.0.tgz",
-      "integrity": "sha512-BIsIaGqv7uTQgTW1KLTMNPSEQf4zDDPgYOBRdgOfuB+JFOLRBfEu6cLa/KvMvmqggu1FKXDfitjLwsq4827RvA==",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/tap-parser/-/tap-parser-7.0.0.tgz",
+      "integrity": "sha512-05G8/LrzqOOFvZhhAk32wsGiPZ1lfUrl+iV7+OkKgfofZxiceZWMHkKmow71YsyVQ8IvGBP2EjcIjE5gL4l5lA==",
       "dev": true,
       "requires": {
         "events-to-array": "1.1.2",
         "js-yaml": "3.10.0",
-        "readable-stream": "2.3.3"
+        "minipass": "2.2.1"
       }
     },
     "text-table": {
@@ -3409,19 +3970,6 @@
         "punycode": "1.4.1"
       }
     },
-    "tracejs": {
-      "version": "0.1.4",
-      "resolved": "https://registry.npmjs.org/tracejs/-/tracejs-0.1.4.tgz",
-      "integrity": "sha1-KdvrSuEHiS92VIzfob6OGnN1jeY=",
-      "dev": true
-    },
-    "traverse": {
-      "version": "0.5.2",
-      "resolved": "https://registry.npmjs.org/traverse/-/traverse-0.5.2.tgz",
-      "integrity": "sha1-4gPFjV9/DjfbbnTArLkpuwm2HYU=",
-      "dev": true,
-      "optional": true
-    },
     "trivial-deferred": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/trivial-deferred/-/trivial-deferred-1.0.1.tgz",
@@ -3468,17 +4016,10 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
-    "uglify-js": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-1.1.1.tgz",
-      "integrity": "sha1-7nGpfEzv0GoamyBDfzQRiYKqA1s=",
-      "dev": true,
-      "optional": true
-    },
-    "underscore": {
-      "version": "1.3.3",
-      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.3.3.tgz",
-      "integrity": "sha1-R6xTaD2vgyv6lS4XdEF9pHgXrkI=",
+    "uc.micro": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/uc.micro/-/uc.micro-1.0.3.tgz",
+      "integrity": "sha1-ftUNXg+an7ClczeSWfKndFjVAZI=",
       "dev": true
     },
     "unicode-length": {
@@ -3533,6 +4074,16 @@
         }
       }
     },
+    "walk-sync": {
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/walk-sync/-/walk-sync-0.3.1.tgz",
+      "integrity": "sha1-VYoWrqyMDbWcAotzxm85doTs5GU=",
+      "dev": true,
+      "requires": {
+        "ensure-posix-path": "1.0.2",
+        "matcher-collection": "1.0.5"
+      }
+    },
     "which": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
@@ -3563,6 +4114,17 @@
         "mkdirp": "0.5.1"
       }
     },
+    "write-file-atomic": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.3.0.tgz",
+      "integrity": "sha512-xuPeK4OdjWqtfi59ylvVL0Yn35SF3zgcAcv7rBPFHVaEapaDr4GdGgm3j7ckTwH9wHL7fGmgfAnb0+THrHb8tA==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "4.1.11",
+        "imurmurhash": "0.1.4",
+        "signal-exit": "3.0.2"
+      }
+    },
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
diff --git a/package.json b/package.json
index c4fe366..436b879 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "do",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "description": "The simplest way to manage asynchronicity",
   "license": "MIT",
   "author": "Oleg Slobodskoi <oleg008@gmail.com>",
@@ -38,13 +38,13 @@
   "main": "./do.js",
   "readmeFilename": "README.md",
   "scripts": {
-    "test": "node_modules/qunit/bin/cli.js -c Do:./do.js -t ./test.js",
-    "lint": "eslint ."
+    "test": "npm run lint && node_modules/qunit/bin/cli.js -c Do:./do.js -t ./test.js",
+    "lint": "eslint do.js"
   },
   "devDependencies": {
-    "dox": "0.4.2",
-    "qunit": "0.5.15",
-    "eslint": "^4.11.0",
-    "tap": "^10.7.3"
+    "dox": "^0.9.0",
+    "qunit": "^2.4.1",
+    "eslint": "^4.12.0",
+    "tap": "^11.0.0"
   }
 }