chore(package): update mocha to version 7.1.1

Closes #25

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "gulp-filter": "^5.0.0",
     "gulp-git": "^2.4.0",
     "gulp-tag-version": "^1.3.0",
-    "mocha": "^3.1.2",
+    "mocha": "^7.1.1",
     "yeoman-assert": "^3.0.0",
     "yeoman-test": "^1.0.0"
   }