chore(deps): update dependency @types/mocha to v5.2.3

Author: renovate-bot

package.json

@@ -23,7 +23,7 @@
   },
   "devDependencies": {
     "@types/form-data": "2.2.1",
-    "@types/mocha": "5.2.2",
+    "@types/mocha": "5.2.3",
     "codecov": "3.0.2",
     "dateformat": "3.0.3",
     "execa": "0.10.0",