https://bugzilla.redhat.com/show_bug.cgi?id=1026052
--- Comment #7 from Ken Dreyer ktdreyer@ktdreyer.com --- Hi Keiran, I'm checking again to see if you're still interested in maintaining this package?
You probably saw the email from the developer at GitHub. It seems that while github-markdown is technically available from rubygems.org under the MIT license, GitHub didn't intend it to be an open-source project. The Git repository and issue tracker are not public, and GitHub doesn't recommend that Linux distributions package the software due to expectations of instability.