💌 update extract-text-webpack-plugin package

Author: Plortinus

package.json

@@ -17,7 +17,7 @@
     "babel-preset-es2015": "^6.18.0",
     "cross-env": "^1.0.8",
     "css-loader": "^0.23.1",
-    "extract-text-webpack-plugin": "^2.0.0-beta.4",
+    "extract-text-webpack-plugin": "^2.0.0-beta.5",
     "file-loader": "^0.8.5",
     "glob": "^7.1.1",
     "html-webpack-plugin": "^2.26.0",