chore(package): update mocha to version 7.2.0

Closes #46

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "eslint-config-mr": "^1.1.0",
     "expect.js": "^0.3.1",
     "express": "^4.16.4",
-    "mocha": "^6.0.0",
+    "mocha": "^7.2.0",
     "nyc": "^13.3.0",
     "sinon": "^7.2.4",
     "supertest": "^4.0.0"