chore(package): update mocha to version 3.5.0 (#364)

Author: greenkeeper[bot]

package.json

@@ -83,7 +83,7 @@
     "flow-bin": "0.51.1",
     "graphql": "0.10.5",
     "isparta": "4.0.0",
-    "mocha": "3.4.2",
+    "mocha": "3.5.0",
     "multer": "1.3.0",
     "prettier": "^1.3.1",
     "restify": "4.3.0",