docs: diff code block 🍥

Author: fz6m

README.md

@@ -47,13 +47,13 @@ module.exports = {
         use: [
           'style-loader', // or MiniCssExtractPlugin.loader
           'css-loader',
-          'postcss-loader',
-          {
-            loader: 'parcel-css-loader',
-            options: {
-              implementation: parcelCSS
-            }
-          }
+-         'postcss-loader',
++         {
++           loader: 'parcel-css-loader',
++           options: {
++             implementation: parcelCSS
++           }
++         }
           'sass-loader'
         ],
       },