Add browserslist recommendation

Author: ai

README.md

@@ -127,6 +127,28 @@ module.exports = {
 }
 ```
 
+### Autoprefixer
+
+We don’t recommend to put Autoprefixer’s browsers to plugin options.
+Webpack `css-loader` contains `cssnano`. It uses Autoprefixer too.
+
+As result you will have different browsers in Autoprefixer
+and CSS minification. At result, `css-loader` could clean some prefixes
+in production.
+
+We recommend to put browsers in `browserslist` config in project root:
+
+```
+last 2 versions
+ie 11
+```
+
+As result other tools (for example, Stylelint) will use same browsers settings.
+
+Also, [please vote] for disable second Autoprefixer in `css-loader`.
+
+[please vote]: https://github.com/webpack/css-loader/issues/281
+
 ## Options
 
 ### Syntaxes