Add to matplotlib 3rd party packages

[ianhi]

This package looks neat and well made. I'd recommend you increase the visibility by:

1. Open a PR adding it to https://matplotlib.org/3.3.3/thirdpartypackages/index.html
2. add a "Framework :: Matplotlib" Trove classifier.

Theres also some tips on this discourse post https://discourse.matplotlib.org/t/docs-for-a-method-wrapping-a-matplotlib-method/21055/8?u=ianhi (and the replies) about making a 3rd party package. Including that you should tweet @matplotlib about it.

[mwshinn]

Thanks for the tips. I'm not ready for CanD to go to a broader audience quite yet, since there are still a few rough edges and it is in need of proper documentation, but I will keep this issue open for when the time comes to promote it more widely.