message: webpack.config.js: removed useless configurations
diff: const path = require('path');
  -const webpack = require('webpack');
  const MiniCssExtractPlugin = require('mini-css-extract-plugin');
  const merge = require('webpack-merge');
  -const pkg = require('./package.json');
  const cssTransformOptions = require('./postcss.config.js');
  const isProduction = process.env.NODE_ENV === 'production';
  const config = {
  entry: {
  - vkui: path.resolve(__dirname, 'src/index.js')
  + vkui: './src/index.js'
  },
  output: {
  path: path.resolve(__dirname, 'dist'),
  @@ -20,7 +18,7 @@ const config = {
  rules: [
  {
  test: /\.js?$/,
  - exclude: /node_modules\/(?!vkui)(.+)/,
  + exclude: /node_modules/,
  loader: 'babel-loader'
  },
  {
  @@ -52,15 +50,7 @@ const config = {
  const devConfig = {};
  -const prodConfig = {
  - plugins: [
  - new webpack.DefinePlugin({
  - 'process.env.NODE_ENV': `"production"`,
  - 'process.env.VKUI_VERSION': `"${pkg.version}"`
  - }),
  - new webpack.NoEmitOnErrorsPlugin()
  - ]
  -};
  +const prodConfig = {};
  module.exports = isProduction
  ? merge(config, prodConfig)
  