Add CHANGELOG.md

Author: Timon de Groot

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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [1.1.1] - 2021-06-10
+### Added
+- Support for Magento 2.4
+
+## [1.1.0] - 2019-11-27
+### Changed
+- Namespace from Marissen to Mooore
+
+## [1.0.0] - 2019-09-30
+### Added
+- Initial release