git-tfs/git-tfs.github.com — pull request #3 by spraints (2014-06-24 18:58:21+00:00)
Title: No more maruku

Got an email after the most recent update:

> Your site is using Maruku, the default Markdown interpreter. Maruku is now obsolete and may cause builds to fail for sites with invalid Markdown or HTML. See https://help.github.com/articles/migrating-your-pages-site-from-maruku for more information on upgrading to a newer Markdown interpreter.

This makes the recommended change.