chore(package): update eslint to version 3.4.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -31,7 +31,7 @@
     "ws": "1.1.1"
   },
   "devDependencies": {
-    "eslint": "3.3.1",
+    "eslint": "3.4.0",
     "expect.js": "0.3.1"
   }
 }