Post-release cleanup

Author: brews

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).
 
+## [Unreleased]
+
 ## [0.2.0] - 2026-05-14
 
 ### Added
@@ -31,5 +33,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial release.
 
+[Unreleased]: https://github.com/climateimpactlab/isku/compare/v0.2.0...HEAD
 [0.2.0]: https://github.com/climateimpactlab/isku/compare/v0.1.0...v0.2.0
 [0.1.0]: https://github.com/climateimpactlab/isku/releases/tag/v0.1.0