I think it's fairly simple to continue testing this on Python 2.7, so I created #102.

I realize that 2.7 is way out of support, and I do suspect that most people are 100% off it, but this is a dead simple data-only package, and as long as the testing burden is relatively low I like the idea of making sure that it's got maximum compatibility (or at least that we know when we would break compatibility).