chore(deps): update dependency webpack-cli to v3

Author: renovate-bot

package.json

@@ -84,7 +84,7 @@
         "rimraf": "2.6.2",
         "styled-components": "3.2.6",
         "webpack": "4.8.3",
-        "webpack-cli": "2.1.4",
+        "webpack-cli": "3.2.2",
         "webpack-dev-server": "3.1.4"
     }
 }