Github has published an official CLI: https://github.com/cli/cli
It's pretty barebones, but WIP, so maybe it becomes a good client.
I also just installed Hub (https://hub.github.com/) which seems to cover a great big part of Github's functionality.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko