Include setuptools in requirements-dev.txt

Author: Brandon Duffany

README.md

@@ -13,6 +13,3 @@ Once you've got a Selenium server running, simply run `$ tox` from within the
 repo. If you don't have tox, run `$ sudo pip3 install -r requirements-dev.txt`
 from within the repo to install it.
 
-When running tox, you might get a `pkg_resources.DistributionNotFound` error
-with reference to `virtualenv`. This is likely due to an out of date setuptools.
-To fix this issue, run `$ sudo pip3 install -U setuptools`.

requirements-dev.txt

@@ -1,4 +1,5 @@
 flake8
 pytest
+setuptools>=12.1
 tox
 virtualenv