Update flake8 from 3.3.0 to 3.4.1

pyup-bot · pyup-bot · commit be98df49c34f · 2017-07-28T16:05:03.000+02:00
diff --git a/requirements_dev.txt b/requirements_dev.txt
@@ -2,7 +2,7 @@ pip==9.0.1
 punch.py==1.4.0
 wheel==0.29.0
 watchdog==0.8.3
-flake8==3.3.0
+flake8==3.4.1
 tox==2.7.0
 coverage==4.4.1
 Sphinx==1.6.3
