Add 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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.2.1] - 2022-10-11
+### Fixed
+- lock access to certificate maps to avoid crash due to concurrent map access
+### Added
+- add this Changelog
+
+## [0.2.0] - 2022-10-08
+### Added
+- allow configuration of log levels
+### Changed
+- watch for create, write, chmod and rename of CRL files
+
+## [0.1.0] - 2022-09-10
+### Added
+- Initial release with support for CRLs and openssl index.txt as certificate databases.