chore(package): update mocha to version 7.2.0

Closes #9

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
   "devDependencies": {
     "fs-extra": "^2.0.0",
     "jshint": "^2.9.4",
-    "mocha": "^4.0.0",
+    "mocha": "^7.2.0",
     "yeoman-assert": "^3.0.0",
     "yeoman-test": "^1.6.0"
   }