chore(package): update mocha to version 7.1.0

Closes #7

Author: greenkeeper[bot]

package.json

@@ -22,7 +22,7 @@
   "devDependencies": {
     "express": "^4.16.4",
     "jshint": "^2.9.6",
-    "mocha": "^6.0.0",
+    "mocha": "^7.1.0",
     "should": "^13.2.3",
     "supertest": "^3.4.1"
   },