docs: update README (#533)

Author: gesposito

README.md

@@ -700,9 +700,9 @@ module.exports = {
 
 For `production` builds it's recommended to extract the CSS from your bundle being able to use parallel loading of CSS/JS resources later on.
 This can be achieved by using the [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin), because it creates separate css files.
-For `development` mode (including `webpack-dev-server`) you can use `style-loader`, because it injects CSS into the DOM using multiple <style></style> and works faster.
+For `development` mode (including `webpack-dev-server`) you can use `style-loader`, because it injects CSS into the DOM using multiple `<style></style>` and works faster.
 
-> i Do not use together `style-loader` and `mini-css-extract-plugin`.
+> ⚠ Do not use together `style-loader` and `mini-css-extract-plugin`.
 
 **webpack.config.js**