Unnecessary dependency on setuptools?

Hi! Wondering, why httpie has a runtime dependency on setuptools? 
https://github.com/httpie/cli/blob/5b604c37c6c67e18e7c3e9aee6c88a8c22b98345/setup.cfg#L57

From what I can tell from search https://github.com/search?q=repo%3Ahttpie%2Fcli%20setuptools&type=code, the only place where it's actually used is one test, but then it could be in the `dev` dependencies section? 

Thanks!
