prepare release

Author: dbu

Diff for: CHANGELOG.md

@@ -5,7 +5,14 @@ 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).
 
-## 2.2.0 - 2020-14-12
+## 2.2.1 - 2021-12-10
+
+### Added
+
+- Symfony 6 support
+- Tested with PHP 8.1
+
+## 2.2.0 - 2020-12-14
 
 ### Added