Update dependency webpack-cli to v3.3.7

Author: renovate-bot

package.json

@@ -105,7 +105,7 @@
     "style-loader": "0.23.1",
     "terser-webpack-plugin": "1.4.1",
     "webpack": "4.39.1",
-    "webpack-cli": "3.3.6",
+    "webpack-cli": "3.3.7",
     "webpack-dev-server": "3.7.2",
     "webpack-merge": "4.2.1"
   }