There are a few ways to get in touch with the ivatar/libravatar developers:
If you have an IRC client already, you can join #libravatar on chat.freenode.net.
Otherwise, you can use this simple web interface.
Please keep in mind that you may live in a different timezone than most of the developers. So if you do not get a response, it's not because we're ignoring you, it's probably because we're sleeping :)
If you have a question about a particular bug, or some feedback on it, the best thing to do is to comment on that bug itself.
We use the bugtracker included in our GitLab instance.