chore(package): update mocha to version 3.5.3

Closes #22

Author: greenkeeper[bot]

package.json

@@ -41,7 +41,7 @@
     "loopback": "3.8.0",
     "loopback-connector-mongodb": "3.2.0",
     "loopback-testing": "1.4.0",
-    "mocha": "3.4.2",
+    "mocha": "3.5.3",
     "nyc": "11.0.3",
     "semantic-release": "6.3.6",
     "validate-commit-msg": "2.12.3"