docs: note about webpack version (#531)

webpack-contrib · Jun 10, 2021 · c715df2 · c715df2
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diff --git a/README.md b/README.md
@@ -41,6 +41,8 @@ Loader to process CSS with [`PostCSS`](https://github.com/postcss/postcss).
 
 ## Getting Started
 
+You need webpack v5 to use the latest version. For Webpack v4, you have to install postcss-loader v4.
+
 To begin, you'll need to install `postcss-loader` and `postcss`:
 
 ```console