chore(package): update mocha to version 3.0.2 (#37)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -35,7 +35,7 @@
   "devDependencies": {
     "debug": "^2.2.0",
     "eslint-config-mongodb-js": "^2.2.0",
-    "mocha": "^2.5.3",
+    "mocha": "^3.0.2",
     "mongodb-js-fmt": "^0.0.3",
     "mongodb-js-precommit": "^0.2.9",
     "mongodb-runner": "^3.3.2",