Bump changelog to v0.3.1

Made-with: Cursor

Author: Woody4618

CHANGELOG.md

@@ -5,7 +5,7 @@ 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).
 
-## [0.3.0] - 2026-04-29
+## [0.3.1] - 2026-04-29
 
 - Update all github-actions to v0.2.9
 - Update squads-program-action to v0.4.0