Bump tox from 3.5.2 to 3.14.0 (#601)

dependabot-preview[bot] · web-flow · commit cce045ae9c11 · 2019-09-21T12:23:41.000Z
diff --git a/requirements.txt b/requirements.txt
@@ -3,7 +3,7 @@ docker==4.0.2
 flake8==3.5.0
 -e .[sa]
 sphinx==2.2.0
-tox==3.5.2
+tox==3.14.0
 pytest==3.9.1
 pytest-cov==2.7.1
 pytest-sugar==0.9.2
