Updates CHANGELOG:

mentions the new  feedback buttons to AI-generated Changelog feature
(#4449, #4479)

Author: sergeibbb

CHANGELOG.md

@@ -16,6 +16,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 ### Changed
 
 - Changes branch favoriting to apply to both local and remote branch pairs ([#4497](https://github.com/gitkraken/vscode-gitlens/issues/4497))
+- Adds 👍 "Helpful" and 👎 "Unhelpful" feedback buttons to AI-generated Changelog ([#4449](https://github.com/gitkraken/vscode-gitlens/issues/4449))
 
 ## [17.3.2] - 2025-07-22