Added `HTTPProtocol` for type annotations, which will help annotate libraries using HTTP protocol managers, like WiFi manager classes.
To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-typing`.
Read the [docs](http://circuitpython.readthedocs.io/projects/typing/en/latest/) for info on how to use it.