Add CHANGELOG.md

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]
+
+### Added 
+
+- Added `--set-discharge-mosfet` parameter to turn the mosfet on and off (#3)
+- Added cycle count to `--status` for Sinowealth BMS 
+- Implemented `--all` for Sinowealth BMS
+- Added MQTT support (#13)
+- Implemented capacity, pack status, errors commands for Sinowealth BMS (#14)
+
+### Fixed
+
+- Fixed cell voltage command for 3S BMS (#5)
+
+## [0.2.0] - 2021-06-28
+
+### Added
+
+- Support for 3S-4S Daly BMS with Sinowealth chip (#2)
+- Added `--uart` parameter for using UART instead of RS485 interfaces
+
+## [0.1.0] - 2021-05-14
+
+### Added
+
+- Initial support for Daly BMS devices