Fix Bonus features title

Author: MoOx

README.md

@@ -65,6 +65,7 @@ Follow [@cssnext on Twitter](https://twitter.com/cssnext) to get the latest news
 ([⇗](https://github.com/axa-ch/postcss-pseudoelements))
 * [rgba()](http://www.w3.org/TR/css3-color/)
 ([⇗](https://github.com/postcss/postcss-color-rgba-fallback))
+
 ### Bonus features
 
 _<small>The features below are considered as bonus since it's totally not related to CSS specs</small>._