add missing edit in changelog (#880)

Author: Stephan Dilly

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Added
 - added support for markdown emoji's in commits [[@andrewpollack](https://github.com/andrewpollack)] ([#768](https://github.com/extrawurst/gitui/issues/768))
+- added scrollbar to revlog [[@ashvin021](https://github.com/ashvin021)] ([#868](https://github.com/extrawurst/gitui/issues/868))
 
 ## Fixed
 - fix commit msg being broken inside tag list ([#871](https://github.com/extrawurst/gitui/issues/871))