chore: prepare release 2.2.0

Author: ramsey

CHANGELOG.md

@@ -6,6 +6,11 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 
+## 2.2.0 - 2023-03-17
+
+* Set minimum PHP version to 8.1.
+
+
 ## 2.1.0 - 2023-01-14
 
 ### Changed