chore(package): update coffee-script to version 1.11.1

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -30,7 +30,7 @@
   },
   "devDependencies": {
     "chai": "^3.3.0",
-    "coffee-script": "^1.10.0",
+    "coffee-script": "^1.11.1",
     "mocha": "^3.1.2"
   },
   "engines": {