Mentions Bitbucket issues support in the changelog

(#4047, #4119)

Author: sergeibbb

CHANGELOG.md

@@ -14,6 +14,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 - Adds integration with Bitbucket Cloud ([#3916](https://github.com/gitkraken/vscode-gitlens/issues/3916))
   - shows enriched links to PRs and issues [#4045](https://github.com/gitkraken/vscode-gitlens/issues/4045)
   - shows Bitbucket PRs in Launchpad [#4046](https://github.com/gitkraken/vscode-gitlens/issues/4046)
+  - supports Bitbucket issues in Start Work and lets associate issues with branches [#4047](https://github.com/gitkraken/vscode-gitlens/issues/4047)
 
 ### Changed