chore(package): update mocha to version 3.2.0 (#16)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -8,7 +8,7 @@
   "devDependencies": {
     "cat-stream": "*",
     "istanbul": "0",
-    "mocha": "3.1.2",
+    "mocha": "3.2.0",
     "sinon": "^1.17.2"
   },
   "scripts": {