Changing this here will change the lock, won't it?

I was thinking that instead of changing it up here, we would change it [down here](https://github.com/ericmj/elixir/blob/3063a9fb31b6dab582012b47286ede3c111a6c8a/lib/mix/lib/mix/scm/git.ex#L45) by checking any URL that matches `"git://github.com/" <> rest`. This would mean it not only works with github but with any github project. What do you think?