Release v3.1.0c1

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 brake()/light.off() not working on Move hub I/O port C (support#501).
• 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.