chore(package): update copy-webpack-plugin to version 6.0.1

Closes #12

Author: greenkeeper[bot]

www/package.json

@@ -16,6 +16,6 @@
     "webpack": "^4.16.3",
     "webpack-cli": "^3.1.0",
     "webpack-dev-server": "^3.1.5",
-    "copy-webpack-plugin": "^5.0.0"
+    "copy-webpack-plugin": "^6.0.1"
   }
 }