Update package.json & webpack

webpack.prod.js

@@ -1,9 +1,11 @@
 const path = require('path')
 const webpack = require('webpack')
+const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
 
 module.exports = {
-  devtool: '#source-map',
-  entry: './src/index.js',
+  entry: {
+    main: './src/index.js'
+  },
   output: {
     path: path.resolve(__dirname, 'dist'),
     filename: 'vue-audio-recorder.min.js',
@@ -12,18 +14,21 @@ module.exports = {
     libraryExport: 'default',
     umdNamedDefine: true
   },
+  optimization: {
+    minimizer: [
+      new UglifyJsPlugin({
+        cache: true,
+        parallel: true,
+        sourceMap: true
+      })
+    ]
+  },
   plugins: [
     new webpack.DefinePlugin({
       'process.env': {
         NODE_ENV: '"production"'
       }
     }),
-    new webpack.optimize.UglifyJsPlugin({
-      sourceMap: true,
-      compress: {
-        warnings: true
-      }
-    }),
     new webpack.LoaderOptionsPlugin({
       minimize: false
     })