DOC: Update changelog for release

CHANGELOG.md

@@ -4,22 +4,12 @@ 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] ##
+## [0.6.1] - 2023-01-20##
 
 ### Added ###
 
 * Re-introduced support for Python 3.7
 
-### Changed ###
-
-### Deprecated ###
-
-### Removed ###
-
-### Fixed ###
-
-### Security ###
-
 ## [0.6.0] - 2022-10-11 ##
 (Florian Spreckelsen)