Tests fail on python >=3.6

[mjeveritt]

I've tried to update your Travis config for newer versions of python3 (my default is 3.7) to the Github/Travis defaults up to 3.10, and I seem to be getting some test failures relating to RuntimeError raising (or not raising) OSError. Tests are a little out of my python experience so far, so I wonder if you could shed some light on what's going wrong (you can peruse my fork, and the travis tests on travis-ci.com/mjeveritt hopefully).

I also unwittingly tried to port the Travis configuration over to github actions (you'll see this in other branches of my repo), and can't seem to fathom how best to set up tox and coveralls as you had done. I'm sure it's reasonably trivial if you know what you're doing!!

Thanks in advance!

[mjeveritt]

The underlying motivation (FYI) was adding the original Orange Pi Plus (not PC Plus nor One Plus nor Plus 2E) pin configuration, which matches other H3 CPUs according to https://github.com/orangepi-xunlong/wiringOP#orangepi-onelitepcpluspcplusplus2e .

This I can PR once I've confirmed I can test the rest of the repository, but it's actually a trivial change!