Update webpack.development.config.js

webpack/webpack.development.config.js

@@ -47,7 +47,7 @@ module.exports = [
       new webpack.NoEmitOnErrorsPlugin(),
       new webpack.DefinePlugin({
         'process.env': {
-          'NODE_ENV': JSON.stringify('dev')
+          'NODE_ENV': JSON.stringify('development')
         }
       }),
       new CopyWebpackPlugin([