Why?

GitHub publishes an RSS feed for releases for every repository. I've been trying to switch things to RSS, and Release Notifications on GitHub is a very big pain point. This solves the problem by using your trusty RSS feed reader application instead of it's own thing.

You should also check out kill-the-newsletter for a similar solution with newsletters.

OPML is a common format used to share lists of RSS feeds that you can import in your RSS application