Add CHANGELOG

Author: paulbalandan

CHANGELOG.md

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+# Changelog
+
+All notable changes to this library 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).
+
+## v2.0.0 - 2020-11-28
+
+### Changed
+
+- Initial release in this repository. See [MIGRATION](MIGRATION.md) for the detailed changes
+from its predecessor library.