setuptools.setup function supports a project_urls option which takes a dict with (AFAIK) arbitrary keys, but some keys are recognised by PyPI:
Sourceis used for the sources URL, typically on Github, and decorated by PyPI with a Github icon;
Documentationis the PyPI page (in simple cases) and decorated with a book icon;
Trackeris the bugtracker URL and decorated with a bug icon.
Now, it might be useful to add the Travis CI links there as well, e.g. using the key
Is there some key like this or another in use for this purpose?