Updates CHANGELOG by describing new AI powered actions on a branch

(#4443, #4522)

Author: sergeibbb

CHANGELOG.md

@@ -8,6 +8,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ### Added
 
+- Adds AI powered operations for a branch: "Explain Unpushed Changed". They are added to the _Commit Graph_ and views context menu for branches ([#4443](https://github.com/gitkraken/vscode-gitlens/issues/4443))
 - Adds a new _Safe Hard Reset_ (`--keep`) option to Git _reset_ command
 - Adds support for reference or range commit searches on the _Commit Graph_, _Search & Compare_ view, and in the _Search Commits_ command ([#4723](https://github.com/gitkraken/vscode-gitlens/issues/4723))
   - Adds natural language support to allow for more powerful queries