Works, but the gist is now gone. However, it looks so similar to sublime, I can't believe it. In case anyone is looking for it: the command is
curl -L https://www.atom.io/api/updates/download -A "Atom/0.1 CFNetwork/1.5" > Atom.zip
{"message":"Not Found"}However, I tried right now once more and it seems that it's available again.