Adafruit-circuitpython-typing

Added `I2CDeviceDriver` duck typing class for describing classes using `I2CDevice`.

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

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

- Add additional types that were only in circuitpython.
- Add `py.typed` so this library can be used with MyPy properly.

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

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

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

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

What's Changed

* allow use in Python 3.7 by dhalbert in https://github.com/adafruit/Adafruit_CircuitPython_Typing/pull/4

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

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

What's Changed
* added ByteStream protocol by rimwolf-redux in https://github.com/adafruit/Adafruit_CircuitPython_Typing/pull/2

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

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