Updates CHANGELOG

CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ## [Unreleased]
 
+### Added
+
+- Adds a _[Show|Hide] Merge Commits_ toggle to the Commits\_ view — closes [#1399](https://github.com/gitkraken/vscode-gitlens/issues/1399) thanks to [PR #1540](https://github.com/gitkraken/vscode-gitlens/pull/1540) by Shashank Shastri ([@Shashank-Shastri](https://github.com/Shashank-Shastri))
+
 ### Fixed
 
 - Fixes [#2926](https://github.com/gitkraken/vscode-gitlens/issues/2926) - "Open File at Revision" has incorrect editor label if revision contains path separator