Update changelog for 0.2.1

CHANGELOG.md

@@ -4,6 +4,11 @@ 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).
 
+## [0.2.1] - 2024-06-02
+### Improved
+- The LOCKFILE mechanism is much more robust now.
+- Setting the stage for all commands to be through "sudo archiver --argument" rather than through calling various scripts.
+
 ## [0.2.0] - 2024-06-01
 ### Improved
 - Major improvements to speed. Backup to primary storage for all repositories completes first, then each secondary storage copies sequentially.