chore(package): update eslint to version 3.6.1

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -36,7 +36,7 @@
   },
   "devDependencies": {
     "chai": "^3.5.0",
-    "eslint": "~3.4.0",
+    "eslint": "~3.6.1",
     "mocha": "^3.0.0"
   }
 }