chore(deps): update dependency mocha to v6.2.2

Author: renovate-bot

package-lock.json

@@ -52,7 +52,7 @@
     "dont-crack": "1.2.1",
     "git-issues": "1.3.1",
     "license-checker": "16.0.0",
-    "mocha": "6.1.4",
+    "mocha": "6.2.2",
     "nsp": "3.2.1",
     "pre-git": "3.17.1",
     "prettier-standard": "9.1.1",