chore(package): update eslint to version 2.13.1

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -56,7 +56,7 @@
     "conventional-changelog-cli": "1.2.0",
     "coveralls": "2.11.9",
     "del": "2.2.0",
-    "eslint": "2.13.0",
+    "eslint": "2.13.1",
     "eslint-friendly-formatter": "2.0.5",
     "glob": "7.0.4",
     "inject-loader": "2.0.1",