Install requires tox?

[conorbranagan]

Hi,

We're just switching to using kafka-python in our environment and we're noticing that it's pulling additional dependencies because the installation requires tox. I was wondering if we could remove this dependency on installation because it only seems to be used by tests (and it's already in the tests_requires).

I'm happy to open a pull request to to remove this, I just wanted to be certain it's not required somewhere that I'm missing.

[mumrah]

@conorbranagan Thanks for pointing this out, I've remove tox from the install requirements