Fails with CircuitPython

[tannewt]

writeto_then_readfrom isn't available on CircuitPython's busio.I2C (yet). This library should do the same detection routine as I2CDevice does.

Found here: https://forums.adafruit.com/viewtopic.php?f=60&t=154454

[caternuson]

Thanks. I think this is on me. Will take a look.

Need to keep CP calls to write_then_readinto from landing here:
https://github.com/adafruit/Adafruit_CircuitPython_BusDevice/blob/master/adafruit_bus_device/i2c_device.py#L147
Only blinka calls should go down that route.

[caternuson]

I'm closing. We can reopen if needed. Hopefully fixed with #12