Adafruit-circuitpython-macropad

What's Changed
* Update root_group for CP 9 compatibility by prcutler in https://github.com/adafruit/Adafruit_CircuitPython_MacroPad/pull/49


**Full Changelog**: https://github.com/adafruit/Adafruit_CircuitPython_MacroPad/compare/2.2.2...2.3.0

To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-macropad`.

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

To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-macropad`.

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

Added sleep property. Property puts the OLED display to sleep or wakes it up after sleep. Thanks kalehmann!

To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-macropad`.

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

Fixed a formatting issue in the description `Macropad.keys` for ReadTheDocs. Thanks prcutler!

To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-macropad`.

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

To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).

To use in CPython, `pip3 install adafruit-circuitpython-macropad`.

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