chore(package): update eslint to version 2.5.1

http://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -27,7 +27,7 @@
   "devDependencies": {
     "ava": "0.13.0",
     "coveralls": "2.11.9",
-    "eslint": "2.4.0",
+    "eslint": "2.5.1",
     "eslint-config-pedant": "0.1.1",
     "jscs": "2.11.0",
     "matcha": "0.7.0",