chore(package): update mocha to version 7.1.1

Closes #58

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
     "eslint-plugin-node": "^11.0.0",
     "eslint-plugin-prettier": "^3.1.2",
     "express": "^4.13.4",
-    "mocha": "^5.0.0",
+    "mocha": "^7.1.1",
     "prettier": "^1.19.1",
     "request": "^2.88.0",
     "request-promise": "^4.2.1"