Test Multiple Python Versions

[ThomasLaPiana]

Is your feature request related to a specific problem?

We aren't testing across multiple python versions, only Python 3.8

Describe the solution you'd like

Using Nox to support testing against multiple python versions (requires #533 to be merged first)

Describe alternatives you've considered, if any

Using tox to set up matrix testing

Additional context

We are currently telling PyPi that we support python 3.8-3.10, but we haven't actually tested any of this