Replaced ugilfyjs with terser

webpack.config.js

@@ -3,7 +3,7 @@ const webpack = require('webpack');
 const path = require('path');
 const HtmlWebpackPlugin = require('html-webpack-plugin');
 const MiniCssExtractPlugin = require('mini-css-extract-plugin');
-const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
+const TerserPlugin = require('terser-webpack-plugin');
 const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");
 
 // Paths
@@ -143,7 +143,7 @@ module.exports = env => {
 
     optimization: {
       minimizer: [
-        new UglifyJsPlugin({
+        new TerserPlugin({
           cache: true,
           parallel: true,
           sourceMap: true // set to true if you want JS source maps