Use tox-venv to reduce warnings in output

Ryan P Kilby · Ryan P Kilby · commit a959e2edeb75 · 2018-08-22T21:10:38.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -44,7 +44,7 @@ matrix:
       - env: DJANGO=2.1
 
 install:
-    - pip install tox tox-travis
+    - pip install tox tox-venv tox-travis
 
 script:
     - tox
