Update tox from 3.0.0 to 3.1.1

pyup-bot · pyup-bot · commit 87d3656f4d54 · 2018-07-10T05:53:12.000+02:00
diff --git a/requirements_dev.txt b/requirements_dev.txt
@@ -3,7 +3,7 @@ bumpversion==0.5.3
 wheel==0.31.1
 watchdog==0.8.3
 flake8==3.5.0
-tox==3.0.0
+tox==3.1.1
 coverage==4.5.1
 Sphinx==1.7.5
 pytest==3.6.2
