chore(package): update mocha to version 5.0.4

Closes #25

Author: greenkeeper[bot]

package.json

@@ -58,7 +58,7 @@
     "loopback-component-fixtures": "1.1.0",
     "loopback-context": "1.0.0",
     "loopback-testing": "1.4.0",
-    "mocha": "3.4.2",
+    "mocha": "5.0.4",
     "nodemon": "1.11.0",
     "nyc": "10.3.2",
     "semantic-release": "6.3.6",