Add changelog

modbus-mqtt/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],
+and this project adheres to [Semantic Versioning].
+
+## [Unreleased]
+
+- ...
+
+## [0.2.0] - 2022-09-09
+
+### Changed
+
+- README better documents usage
+- Massive refactor by @bjeanes in https://github.com/bjeanes/modbus-mqtt/pull/4
+
+### Breaking
+
+- Topic paths have changed
+- CLI options have changed (takes a single MQTT URL now)
+
+## [0.1.0] - 2022-08-30
+
+- Initial release
+- Basic support for monitoring a Modbus device and publishing register values to MQTT, including parsing numerics
+
+<!-- Links -->
+[keep a changelog]: https://keepachangelog.com/en/1.0.0/
+[semantic versioning]: https://semver.org/spec/v2.0.0.html
+
+<!-- Versions -->
+[unreleased]: https://github.com/bjeanes/modbus-mqtt/compare/modbus-mqtt-v0.2.0...HEAD
+[0.2.0]: https://github.com/bjeanes/modbus-mqtt/compare/modbus-mqtt-v0.1.0...modbus-mqtt-v0.2.0
+[0.1.0]: https://github.com/bjeanes/modbus-mqtt/releases/tag/modbus-mqtt-v0.1.0