chore(package): update eslint to version 2.3.0

http://greenkeeper.io/

package.json

@@ -52,7 +52,7 @@
     "babel-istanbul": "0.6.x",
     "babel-polyfill": "6.6.x",
     "coveralls": "~2.11.4",
-    "eslint": "~1.10.3",
+    "eslint": "~2.3.0",
     "eslint-config-airbnb": "~3.1.0",
     "glob": "~6.0.4",
     "expect": "~1.13.4",