chore(package): update mocha to version 7.2.0

Closes #27

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "chai": "4.2.0",
     "husky": "3.0.1",
     "lint-staged": "9.2.0",
-    "mocha": "6.2.0",
+    "mocha": "7.2.0",
     "nock": "10.0.6",
     "node-typescript": "0.1.3",
     "nyc": "14.1.1",