Allow underscores in repository names.
Repository names may contain underscores, but they can't start with one.
@fillup Can we get this merged? :P
@fillup poke
Hey @fillup, would you mind merging this?
Ping.
@gfl-chris are you still interested in this change getting through? Looks like I had a question back in August but haven't heard back.
@briskt This is a simple PR, even though the tests weren't written. Would you review this, merge it if it looks good, and then go ahead and add in the tests fillup mentions?