chore(package): update mocha to version 5.0.0

Closes #27

Author: greenkeeper[bot]

package.json

@@ -51,7 +51,7 @@
     "loopback-boot": "^2.24.0",
     "loopback-component-explorer": "^4.2.0",
     "loopback-testing": "^1.4.0",
-    "mocha": "^3.3.0",
+    "mocha": "^5.0.0",
     "nodemon": "^1.11.0",
     "nyc": "^11.0.0",
     "semantic-release": "^6.3.2",