Merge pull request #11 from xx45/dev

chore(eslint): eslint to test file

.eslintrc

@@ -1,5 +1,11 @@
 {
   "extends": "airbnb-base",
+  "plugins": [
+    "jest"
+  ],
+  "env": {
+    "jest/globals": true
+  },
   "rules": {
     "semi": [2, "never"]
   }

.gitignore

@@ -6,6 +6,8 @@
 
 # npm
 node_modules
+yarn.lock
+package-lock.json
 
 # jest
 coverage

.travis.yml

@@ -7,6 +7,7 @@ node_js:
   - '6'
 install:
   - npm install -g codecov
+  - npm install
 script:
   - npm run lint
   - npm test

ReadMe.md

@@ -2,5 +2,5 @@
 
 [![NPM version](https://img.shields.io/npm/v/dayjs.svg?style=flat-square)](https://www.npmjs.com/package/dayjs)
 [![Build Status](https://img.shields.io/travis/xx45/dayjs/master.svg?style=flat-square)](https://travis-ci.org/xx45/dayjs)
-[![codecov](https://img.shields.io/codecov/c/github/xx45/dayjs/master.svg?style=flat-square)](https://codecov.io/gh/xx45/dayjs)
+[![Codecov](https://img.shields.io/codecov/c/github/xx45/dayjs/master.svg?style=flat-square)](https://codecov.io/gh/xx45/dayjs)
 [![License](https://img.shields.io/npm/l/dayjs.svg?style=flat-square)](https://github.com/xx45/dayjs/blob/master/LICENSE)