Merge pull request #2065 from PyCQA/fix-dogfood

fix dogfood tox environment

Author: asottile

tox.ini

@@ -17,7 +17,7 @@ commands =
 [testenv:dogfood]
 skip_install = true
 deps =
-    wheel
+    setuptools
 commands =
     python setup.py -qq bdist_wheel
     pip install --force-reinstall -U --pre --find-links ./dist/ flake8