Allows derived classes to instance without parsing the `secrets` dictionary, which allows for use of derived classes without providing network information.
To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-portalbase`.
Read the [docs](http://circuitpython.readthedocs.io/projects/portalbase/en/latest/) for info on how to use it.