Do not setup bdist

[emord]

Found this while releasing a new version. I think this was left over from before we had cython, not sure why it wasn't caught till now

https://wheel.readthedocs.io/en/stable/user_guide.html

If your project contains no C extensions and is expected to work on both Python 2 and 3, you will want to tell wheel to produce universal wheels by adding this to your setup.cfg file:

We contain C extensions, so we shoudn't set this