📚 Adding a CHANGELOG

CHANGELOG.md

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+# Changelog
+
+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/).
+
+## [Unreleased]
+
+### Fixed
+
+- Allowing to mark more than 50 items as done (#7).
+- Fixes for bash 3 (#6).
+
+## [0.1] - 2023-12-24
+
+### Added
+
+- Initial version
+
+[unreleased]: https://github.com/paulbarton90/gh-clean-notifications/compare/v0.1...HEAD
+[0.1]: https://github.com/paulbarton90/gh-clean-notifications/releases/tag/v0.1