chore: update changelog for release

Author: e111077

CHANGELOG.md

@@ -4,8 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## Unreleased
+<!-- ## Unreleased -->
 
+## [v0.23.0] - 2021-09-13
+
+**This is the last Lit 1 release. Future releases will be using Lit 2.0.0**
 ### Changed
 
 - `switch`