Stick some diffs in your Github commit feed!

Just provide the commit feed url as a query parameter, like so:

http://github-rss.herokuapp.com/?feed=https://github.com/username/project/commits/master.atom
If it is a private repo, you'll need to escape the '?' and '&' in the feed url with '%3f' and '%26' respectively, like so:
http://github-rss.herokuapp.com/?feed=https://github.com/username/project/commits/master.atom%3flogin=my_login%26token=1adefed234

Source is available on github.