chore: fix

README.md

@@ -18,12 +18,12 @@ This plugin uses [terser](https://github.com/terser-js/terser) to minify your Ja
 
 ## Getting Started
 
-If you are using webpack v5 or above you do not need to install this plugin. Webpack v5 comes with the latest `terser-webpack-plugin` out of the box.
+If you are using webpack v5 or above you do not need to install this plugin. Webpack v5 comes with the latest `terser-webpack-plugin` out of the box. Using Webpack v4, you have to install terser-webpack-plugin v4.
 
-To begin when using webpack v4, you'll need to install `terser-webpack-plugin`:
+To begin, you'll need to install `terser-webpack-plugin`:
 
 ```console
-$ npm install terser-webpack-plugin@4 --save-dev
+$ npm install terser-webpack-plugin --save-dev
 ```
 
 Then add the plugin to your `webpack` config. For example: