rename section for consistency

Author: extrawurst

CHANGELOG.md

@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Breaking Changes
 
-#### Shell
+#### Changes
 * use default shell instead of bash on Unix-like OS [[@yerke](https://github.com/yerke)] ([#2343](https://github.com/extrawurst/gitui/pull/2343))
 
 ### Fixes