Adafruit-circuitpython-pca9685

Prep for CircuitPython 3.x which will have `struct` instead of `ustruct`. Thanks to mrmcwethy

To use in CircuitPython, download the .zip file and copy its contents to the `lib` folder on the `CIRCUITPY` drive. Or, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Addafruit_CircuitPython_Bundle).

Read the [docs](https://micropython-pca9685.readthedocs.io/en/latest/) for info on how to use it.

Bump of release version for CircuitPython 2.0 and up releases. The mpy file on this release can ONLY be used on CircuitPython 2.0 and above!

This requires [CircuitPython](https://github.com/adafruit/circuitpython/releases) 0.9.4+!

Update the examples to `busio` which uses bitbanging on the ESP8266.

Switched to UnaryStruct for simplified register access. Note this requires the latest version of Adafruit_Register!