docs: update CHANGELOG.md for v0.3.1

Author: github-actions[bot]

CHANGELOG.md

@@ -5,6 +5,12 @@ 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).
 
+## [v0.3.1] - 2025-07-31
+
+### Added
+
+- Implement automated changelog generation following best practices
+
 ## [Unreleased]
 
 ### Added
@@ -47,3 +53,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [0.1.1]: https://github.com/d-oit/gh-sub-issues/compare/v0.1.1...v0.1.2
 [0.1.0]: https://github.com/d-oit/gh-sub-issues/compare/v0.1.0...v0.1.1
 [Unreleased]: https://github.com/d-oit/gh-sub-issues/compare/v0.3.0...HEAD
+
+[0.3.0]: https://github.com/d-oit/gh-sub-issues/compare/v0.3.0...HEAD
+[0.2.0]: https://github.com/d-oit/gh-sub-issues/compare/v0.2.0...v0.3.0
+[0.1.4]: https://github.com/d-oit/gh-sub-issues/compare/v0.1.4...v0.2.0
+[0.1.3]: https://github.com/d-oit/gh-sub-issues/compare/v0.1.3...v0.1.4
+[0.1.2]: https://github.com/d-oit/gh-sub-issues/compare/v0.1.2...v0.1.3
+[0.1.1]: https://github.com/d-oit/gh-sub-issues/compare/v0.1.1...v0.1.2
+[0.1.0]: https://github.com/d-oit/gh-sub-issues/compare/v0.1.0...v0.1.1