chore(package): update mocha to version 3.0.2

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -30,7 +30,7 @@
   "devDependencies": {
     "babel": "^5.8.23",
     "chokidar": "^1.2.0",
-    "mocha": "^2.3.3",
+    "mocha": "^3.0.2",
     "standard": "^5.3.1"
   },
   "dependencies": {