chore(package): update steal-tools to version 2.2.3

Closes #435

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "steal": "^2.2.1",
     "steal-css": "^1.0.0",
     "steal-qunit": "^2.0.0",
-    "steal-tools": "^1.0.0",
+    "steal-tools": "^2.2.3",
     "test-saucelabs": "^0.0.6",
     "testee": "^0.9.0"
   },