CHANGELOG: Document motor updates.
## [Unreleased]
+### Added
+- Added `DriveBase.curve()` method to drive an arc segment.
+- Added `then` and `wait` arguments to `DriveBase` methods ([support#57]).
+
### Changed
- Dropped `integral_range` argument from `Control.pid()`. This setting was
ineffective and never used. When set incorrectly, the motor could get stuck
for certain combinations of `kp` and `ki`.
- Improved motor behavior for cases with low-speed, low-load, but high
inertia ([support#366]).
+- Changed how the duty cycle limit is set for `Motor` and `DCMotor`. It is now
+ set as a voltage limit via a dedicated method, instead of `Motor.control`.
### Fixed
- Fixed `then=Stop.COAST` being ignored in most motor commands.
- Fixed `Remote()` failing to connect when hub is connected to 2019 or newer
MacBooks ([support#397]).
- Fixed intermittent improper detection of hot-plugged I/O devices ([support#500]).
+- A program now stops when a `Motor` is unplugged while it is running, instead
+ of getting in a bad state.
+[support#57]: https://github.com/pybricks/support/issues/57
[support#366]: https://github.com/pybricks/support/issues/366
[support#397]: https://github.com/pybricks/support/issues/397
[support#500]: https://github.com/pybricks/support/issues/500
