chore(package): update mocha to version 7.2.0

Closes #67

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "eslint-plugin-node": "^10.0.0",
     "graphql": "^14.5.8",
     "husky": "^3.0.5",
-    "mocha": "^6.2.0",
+    "mocha": "^7.2.0",
     "nyc": "^14.1.1",
     "prettier": "^1.19.1",
     "ts-node": "^8.5.4",