Broken with current micropython >= 1.9

[macrojames]

Pin methods were renamed from high/low to on/off on some ports.

AttributeError: 'Pin' object has no attribute 'low'

Release 1.9

[macrojames]

I correct:

• replace deprecated Pin.high()/low() methods with .call(1/0)

[chevdor]

I included a fix to that (amongst a few others) for the 2in9b e-paper display in https://github.com/chevdor/eink