Update dependency webpack-cli to v3.3.2 (#552)

Author: renovate[bot]

package-lock.json

@@ -72,7 +72,7 @@
     "stylelint": "10.0.1",
     "stylelint-config-wordpress": "14.0.0",
     "webpack": "4.31.0",
-    "webpack-cli": "3.3.1",
+    "webpack-cli": "3.3.2",
     "yargs": "13.2.2"
   },
   "engines": {