chore(deps): update dependency mocha to v4.0.1

Author: renovate[bot]

package-lock.json

@@ -41,7 +41,7 @@
     "cz-conventional-changelog": "2.0.0",
     "jscpd": "0.6.15",
     "lodash": "4.17.4",
-    "mocha": "3.5.3",
+    "mocha": "4.0.1",
     "nyc": "11.3.0",
     "rimraf": "2.6.2",
     "semantic-release": "8.2.3",