chore(package): update mocha to version 6.0.1

Closes #171

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "grunt-string-replace": "^1.3.1",
     "microflo-core": "^0.6.0",
     "microflo-arduino": "^0.6.0",
-    "mocha": "^5.0.0",
+    "mocha": "^6.0.1",
     "noflo-nodejs": "^0.10.0"
   },
   "scripts": {