Adafruit-blinka

This release adds the following changes:
* Add Beaglebone Green Gateway Board Support
* Changed actions to use python 3.7
* Add Octavo RED and BRK board support
* Split RP4 board definitions
* Add generic_micropython/__init__.py

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://circuitpython.readthedocs.io/projects/blinka/en/latest/) for info on how to use it.

* Add support for MacroPad u2if. Thanks jfurcean

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://circuitpython.readthedocs.io/projects/blinka/en/latest/) for info on how to use it.

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://circuitpython.readthedocs.io/projects/blinka/en/latest/) for info on how to use it.

Thanks lesamouraipourpre for all the updates!

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://circuitpython.readthedocs.io/projects/blinka/en/latest/) for info on how to use it.

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://circuitpython.readthedocs.io/projects/blinka/en/latest/) for info on how to use it.