Ensure baseband is seen in github dependency graphs

[mhvk]

@theXYZT noted that "baseband doesn't show up correctly on Github dependency graphs because of [the pypi homepage not being the github one]". Turns out pypi gets this via setup.py, which in turn seems to get it from setup.cfg, url=https://baseband.readthedocs.io - so it may be possible to change this, though it is a bit strange that the github_project entry in setup.cfg appears to get ignored.

[mhvk]

E.g., does astropy have the same problem?

[theXYZT]

I may be wrong then. Astropy's homepage is not it's GitHub repository, but it displays correctly in the dependency graph, at least for dependents as seen here: https://github.com/astropy/astropy/network/dependents

[mhvk]

It is still quite confusing where the dependencies actually come from. My impression is that github scrapes pypi descriptions for github addresses, so perhaps just having the address there will help. Maybe a good reason anyway to update and use the package README.rst for the long description.

[mhvk]

It seems this would need a requirements.txt, which is rather out of date for python.