add: npm script for fix codes with standardjs

package.json

@@ -10,6 +10,7 @@
     "webpack": "webpack-dev-server --hot --inline --config webpack.config.js",
     "compile": "grunt compile",
     "test": "PWD=$(pwd) NODE_ENV=test ava",
+    "fix": "standard --fix",
     "lint": "standard"
   },
   "config": {