update CHANGELOG.md

Author: hyugogirubato

CHANGELOG.md

@@ -4,7 +4,7 @@ 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] - 2025-03-01
+## [2.2.1] - 2025-03-01
 
 ### Added
 
@@ -446,6 +446,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 - Initial release of the project, laying the foundation for future enhancements and features.
 
+[2.2.1]: https://github.com/hyugogirubato/KeyDive/releases/tag/v2.2.1
 [2.2.0]: https://github.com/hyugogirubato/KeyDive/releases/tag/v2.2.0
 [2.1.5]: https://github.com/hyugogirubato/KeyDive/releases/tag/v2.1.5
 [2.1.4]: https://github.com/hyugogirubato/KeyDive/releases/tag/v2.1.4