Add CHANGELOG

See https://keepachangelog.com/en/1.0.0/

Co-Authored-By: Martin Lundberg <m-lundberg@users.noreply.github.com>

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] - 2019-03-01
+
+### Fixed
+
+- `ZeroDivisionError` on systems with limited precision time.
+
+## [0.2.0] - 2019-02-26
+
+### Added
+
+- Allow the proportional term to be monitored properly through the components-property when _proportional on measurement_ is enabled.
+
+### Fixed
+
+- Bump in output when re-enabling _auto mode_ after running in _manual mode_.
+
+## [0.1.5] - 2019-01-31
+
+### Added
+
+- The ability to see the contributions of the separate terms in the PID
+
+### Fixed
+
+- D term not being divided by delta time, leading to wrong output values
+
+## [0.1.4] - 2018-10-03
+
+### Fixed
+
+- Use monotonic time to prevent errors that may be difficult to diagnose when the system time is modified. Thanks [@deniz195](https://github.com/m-lundberg/simple-pid/issues/1)
+
+### Added
+
+- Initial implementation
+
+[Unreleased]: https://github.com/m-lundberg/simple-pid/compare/v1.0.0...HEAD
+[0.2.1]: https://github.com/m-lundberg/simple-pid/compare/v0.2.0...v0.2.1
+[0.2.0]: https://github.com/m-lundberg/simple-pid/compare/v0.1.5...v0.2.0
+[0.1.5]: https://github.com/m-lundberg/simple-pid/compare/v0.1.4...v0.1.5
+[0.1.4]: https://github.com/m-lundberg/simple-pid/releases/tag/v0.1.4