Updates CHANGELOG:

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

Author: sergeibbb

CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ## [Unreleased]
 
+### Added
+
+- Adds 👍 "Helpful" and 👎 "Unhelpful" feedback buttons to AI-generated Changelog ([#4449](https://github.com/gitkraken/vscode-gitlens/issues/4449))
+
 ## [17.3.0] - 2025-07-08
 
 ### Added