This looks good to me. I think I missed the fact that in #14 we actually got rid of the firewheel.__version__ variable. Do you think we might be able to restore that, but using the Importlib version accessor? I haven't used importlib in that way before (I've always opted for using a _version.py file) so I'm not sure what it's limitations are as far as being callable in the firewheel.__init__ module.

My thinking is just that I will often try to call <package>.__version__ on packages, especially when debugging, and so it's a nice convenience to have around. I'm happy to merge this PR as is and investigate ways to bring it back if need be. I don't want to hold this one up.