chore(package): update mocha to version 7.1.1

Closes #315

Author: greenkeeper[bot]

package.json

@@ -58,7 +58,7 @@
     "eslint-plugin-promise": "^4.0.1",
     "eslint-plugin-standard": "^4.0.0",
     "express": "^4.16.4",
-    "mocha": "^6.1.1",
+    "mocha": "^7.1.1",
     "nyc": "^15.0.0",
     "sinon": "^7.2.4",
     "sinon-chai": "^3.3.0",