update changelog

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## \[Unreleased\]
+## \[2.6.1\] - 2023-08-25
 ### Added
 
 - More information about task progress on tasks page (<https://github.com/opencv/cvat/pull/5723>)
@@ -19,14 +19,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - More responsive automatic annotation progress bar (<https://github.com/opencv/cvat/pull/6734>)
 - Improved message when invite more users to an organization (<https://github.com/opencv/cvat/pull/6731>)
 
-### Deprecated
-
-- TBD
-
-### Removed
-
-- TBD
-
 ### Fixed
 
 - Exporting project when its tasks has not data (<https://github.com/opencv/cvat/pull/6658>)