chore(package): update mocha to version 3.3.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -15,7 +15,7 @@
     "chai": "3.5.0",
     "coffee-script": "1.12.3",
     "css-parse": "2.0.0",
-    "mocha": "3.2.0",
+    "mocha": "3.3.0",
     "stylus": "0.54.5"
   },
   "scripts": {