added changelog

see #549

Author: Stephan Dilly

Diff for: CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ![charcount](assets/char_count.gif)
 
 ### Fixed
+- fixed key binding for *external exitor* in vim key bindings [[@yanganto](https://github.com/yanganto)] ([#549](https://github.com/extrawurst/gitui/issues/549))
 - fix some potential errors when deleting files while they are being diffed ([#490](https://github.com/extrawurst/gitui/issues/490))
 - push defaults to 'origin' remote if it exists ([#494](https://github.com/extrawurst/gitui/issues/494))
 - support missing pageUp/down support in branchlist ([#519](https://github.com/extrawurst/gitui/issues/519))