GitHub CLI clients
If you just want to manage releases from the commandline, you can use github-release. It uses the recent github releases API. It's written in golang so you can just download the binary and use it without needing install anything else if you want.
DISCLAIMER: I am the author of github-release.
For anyone still looking for a tool to access GitHub API v3 from command line, please have a look at my client library written in ruby github_cli.
Have you had a look at hub or the official gh?