Merge #331

331: Serial clean r=therealprof a=burrbull



Co-authored-by: Andrey Zgarbul <zgarbul.andrey@gmail.com>

Author: bors[bot]

CHANGELOG.md

@@ -38,6 +38,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 
+- Clean features in `serial`
 - Internal implementation of GPIO Pin API changed to use Const Generics
 - Update the sdio driver to match the changes in the PAC
 - Update README.md with current information