chore(package): update mocha to version 7.2.0

Closes #38

package.json

@@ -28,6 +28,6 @@
     "concat-stream": "~2.0.0",
     "derequire": "~2.1.0",
     "istanbul": "~0.4.5",
-    "mocha": "~6.2.0"
+    "mocha": "~7.2.0"
   }
 }