Update CHANGELOG.md format to work with release

CHANGELOG.md

@@ -5,6 +5,8 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+<!-- next-header -->
+
 ## [Unreleased] - ReleaseDate
 
 ### Added
@@ -19,5 +21,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Removed
 
 <!-- next-url -->
-[Unreleased]: https://github.com/cowlicks/hyperbee/compare/v0.2.0...HEAD
+[Unreleased]: https://github.com/cowlicks/hyperbee/compare/v0.2.1...HEAD
+[0.2.1]: https://github.com/cowlicks/hyperbee/compare/v0.2.0...v0.2.1
 [0.2.0]: https://github.com/cowlicks/hyperbee/releases/tag/v0.2.0