Drives Zumi in reverse at a default speed of 40 for 1 second in the direction Zumi is currently facing.
reverse(speed=40, duration=1.0, desired_angle=None)
speed: Positive integer value for speed between 0 and 80
duration: Number of seconds Zumi will drive reverse
desired_angle: Heading or desired angle to drive in (When None is selected Zumi drives wherever she is facing)