One option I found that works it to add a clickable image to your README.md or README.rst.
See example here.
Markdown:
[![gittip](http://i.imgur.com/lg9rx9w.png)](https://www.gittip.com/Miki%20Tebeka/)
ReStructuedText:
.. image:: http://i.imgur.com/lg9rx9w.png
:alt: gittip
:target: https://www.gittip.com/Miki%20Tebeka/
Notes:
- You'll probably want to change gittip user id :)
- There's a discussion on gittip bug tracker on the right way to do this.
- Unofficial gittip image generated using cooltext.