Update dependency webpack-cli to v3.3.8

Author: renovate-bot

package.json

@@ -45,7 +45,7 @@
     "tslint-react": "3.6.0",
     "typescript": "3.3.1",
     "webpack": "4.29.0",
-    "webpack-cli": "3.2.1",
+    "webpack-cli": "3.3.8",
     "webpack-dev-server": "3.1.14"
   }
 }