chore(deps): update dependency mocha to v6.2.3

Author: renovate-bot

package-lock.json

@@ -56,7 +56,7 @@
     "eslint-plugin-standard": "4.0.1",
     "husky": "3.1.0",
     "lint-staged": "9.5.0",
-    "mocha": "6.2.2",
+    "mocha": "6.2.3",
     "npm-github-config": "2.0.1",
     "nyc": "14.1.1",
     "nyc-config-common": "1.0.1",