CHANGELIST update

Author: MattReimer

CHANGELIST.md

@@ -5,6 +5,10 @@ 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).
 
+## [2.2.1] - 2025-12-15
+
+- Fixed multipart ETag calculation in tests to ensure accurate verification against S3 ETags.
+
 ## [2.2.0] - 2025-12-12
 
 ### Added