chore(package): update eslint to version 2.12.0 (#97)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -37,7 +37,7 @@
   },
   "devDependencies": {
     "coffeelint": "^1.14.2",
-    "eslint": "2.11.1",
+    "eslint": "2.12.0",
     "eslint-config-airbnb-base": "^3.0.1",
     "eslint-plugin-import": "^1.7.0"
   },