chore(package): update mocha to version 6.0.2

Closes #47

Author: greenkeeper[bot]

package.json

@@ -74,7 +74,7 @@
     "eslint-plugin-node": "^6.0.0",
     "eslint-plugin-promise": "^3.6.0",
     "eslint-plugin-standard": "^3.0.1",
-    "mocha": "^5.0.0",
+    "mocha": "^6.0.2",
     "node-wget-promise": "^0.1.3",
     "sinon": "^4.5.0",
     "uuid-validate": "0.0.2",