Thanks for the spot, I think it makes more sense to change it to ujson in the setup.py

agree, [ujson] is much clearer, but you need to extend existing setup to support both to backward compatibility. I'm not sure if extend will be ok, so I just fix readme to match code.

that's good thinking @Behoston ! however, we're by now working towards v14, which will break a lot of things anyway. So that wouldn't necessarily be a no-go. Anyway, while I somewhat like the idea to rename json to ujson, the former makes it easier for us to switch to another json-library if we see fit at some point. The other optional requirements socks and passport are also more a description of what the requirements are for, not which lib would be installed. So I think I'm slightly more in favor of adjusting the readme as you currently did.

Thanks for the contribution!