New version of python-ev3dev available

python-ev3dev v2 available in beta (just for stretch)

The highlights include:

• New classes are available for coordinating motors: ev3dev2.motor.MotorSet, ev3dev2.motor.MoveTank, ev3dev2.motor.MoveSteering, and ev3dev2.motor.MoveJoystick.
• Classes representing a variety of motor speed units are available and accepted by many of the motor interfaces: see our docs to learn more.
• Friendlier interfaces for operating motors and sensors: check out ev3dev2.motor.Motor.on_for_rotations and the other on_for_* methods on motors.
• Easier interactivity via buttons: each button now has wait_for_pressed, wait_for_released and wait_for_bump
• Improved ev3dev2.sound.Sound and ev3dev2.display.Display interfaces
• New color conversion methods in ev3dev2.sensor.lego.ColorSensor