Updates changelog by adding a note about GitLab PR search in Launchpad

(#3788, #3795)

Author: sergeibbb

CHANGELOG.md

@@ -8,6 +8,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ### Added
 
+- Adds new ability to search for a GitLab MR in the _Launchpad_ — closes [#3788](https://github.com/gitkraken/vscode-gitlens/issues/3788)
 - Adds go to home view button to the commit graph title section — closes [#3873](https://github.com/gitkraken/vscode-gitlens/issues/3873)
 - Adds a _Contributors_ section to comparison results in the views