Webpack not minifying my bundle js

I'm now bundling my first project with webpack, everything works as expected except webpack is not minifying my bundle.min.js code.

I'm pretty sure I'm doing something wrong, but can't spot the mistake.

Any help would be appreciated. Thanks in advance.

Here I go w/ my webpack.config.js

var webpack = require("webpack");
var ExtractTextPlugin = require("extract-text-webpack-plugin");
var OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin');

module.exports = {
  context: __dirname + "/public",
  entry: './app.js',
  output: {
      path: __dirname + '/dist',
      filename: "bundle.min.js"
  },
  plugins: [
      new webpack.ProvidePlugin({
         $: "jquery",
         jQuery: "jquery"
     }),
     new webpack.LoaderOptionsPlugin({
      minimize: true,
      debug: true
    }),
     new webpack.optimize.UglifyJsPlugin({
       beautify: false,
        mangle: {
          screw_ie8: true,
          keep_fnames: true
        },
        compress: {
          screw_ie8: true
        },
        comments: false
    }),
     new ExtractTextPlugin("bundle.min.css"),
     new OptimizeCssAssetsPlugin()
  ],
  module: {
    loaders: [
      {
        test: /\.css$/,
        loader: ExtractTextPlugin.extract({ fallback: 'style-loader', use: 'css-loader' })
      },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        use: [
          {
            loader: "file-loader",
            options: {
              hash: "sha512",
              digest: "hex",
              name: "./img/[hash].[ext]"
            }
          },
          {
            loader: "image-webpack-loader",
            query: {
              mozjpeg: {
                progressive: true,
              },
              gifsicle: {
                interlaced: false,
              },
              optipng: {
                optimizationLevel: 4,
              },
              pngquant: {
                quality: '75-90',
                speed: 3,
              },
            },
          }
        ]
      },
      {
        test: /\.(eot|svg|ttf|woff|woff2)$/,
        use: [
          {
            loader: "file-loader",
            options: {
              name: "./fonts/[name].[ext]"
            }
          }
        ]
      }
    ]
  }
};

via manelgarcia