Update tox from 3.1.1 to 3.1.2

pyup-bot · pyup-bot · commit 9c1eecffde93 · 2018-07-13T00:24:15.000+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==3.1.1
+tox==3.1.2
 coverage==4.5.1
 Sphinx==1.7.5
 pytest==3.6.3
