Merge pull request phaserjs#4798 from noseglid/patch-3

Move `remove-files-webpack-plugin` to devDependencies

Author: photonstorm

package.json

@@ -68,6 +68,7 @@
     "fs-extra": "^6.0.1",
     "jsdoc": "^3.6.1",
     "node-sloc": "^0.1.11",
+    "remove-files-webpack-plugin": "^1.1.3",
     "uglifyjs-webpack-plugin": "^1.3.0",
     "vivid-cli": "^1.1.2",
     "webpack": "^4.23.0",
@@ -79,7 +80,6 @@
     "eventemitter3": "^3.1.0",
     "exports-loader": "^0.7.0",
     "imports-loader": "^0.8.0",
-    "path": "^0.12.7",
-    "remove-files-webpack-plugin": "^1.1.3"
+    "path": "^0.12.7"
   }
 }