Remove Hotfix of tholo/pytest-flake8#34 [changelog skip]

tholo/pytest-flake8#35 is merged.

Author: earlbread

tox.ini

@@ -5,10 +5,6 @@ skipsdist = true
 [testenv]
 skip_install = true
 commands =
-    ; FIXME: the following command should be removed when
-    ; https://github.com/tholo/pytest-flake8/pull/35 is merged:
-    pip install git+git://github.com/jezdez/[email protected]
-
     pip install -f {distdir} -e .[tests]
     pytest -v