CHANGELOG: start a changelog

Author: dlech

CHANGELOG.md

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+<!-- Refer to https://keepachangelog.com/en/1.0.0/ for guidance. -->
+
+# Changelog
+
+## [3.0.0] - 2021-06-08
+
+### Added
+- Added `Hub.system` attribute ([support#321]).
+
+### Changed
+- `Hub.reset()` moved to `Hub.system.reset()` ([support#321]).
+- Motor methods now raise `OSError` with `uerrno.EBUSY` instead of `uerrno.EPERM`
+  if the motor is currently being used and the operation cannot be completed.
+
+### Fixed
+- Fixed resetting motor angle while holding position causes movement ([support#352]).
+- Fixed `DriveBase` not resetting during initialization ([issue#21]).
+- Fixed <kbd>Ctrl</kbd>+<kbd>C</kbd> stopping REPL when first started ([support#347]).
+- Fixed UART I/O devices retuning uninitialized data ([support#361]).
+
+## Prerelease
+
+Prerelease changes are documented at [support#48].
+
+
+<!-- let's try to keep this list sorted -->
+[issue#21]: https://github.com/pybricks/pybricks-micropython/issues/21
+[support#48]: https://github.com/pybricks/support/issues/48
+[support#321]: https://github.com/pybricks/support/issues/321
+[support#347]: https://github.com/pybricks/support/issues/347
+[support#352]: https://github.com/pybricks/support/issues/352
+[support#361]: https://github.com/pybricks/support/issues/361
+
+[Unreleased]: https://github.com/pybricks/pybricks-micropython/compare/v3.0.0...HEAD
+[3.0.0]: https://github.com/pybricks/pybricks-micropython/compare/v3.0.0c1...v3.0.0