lizard_v0.4.0

New feature and enhancement

• Introduce a module for Igus D1 motors (#63 by @Johannes-Thiel, @falkoschindler)
• Set the "step" pin of the StepperMotor module low when the motor is idle (#16 by @falkoschindler)

Bugfix

• Remove asyncio from requirements.txt (#72 by @JensOgorek, @falkoschindler)