use django 3 for this build

SalmonMode · SalmonMode · commit 18357201c13c · 2020-01-22T17:17:35.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -8,7 +8,7 @@ jobs:
     - stage: test
       python: 3.6
       env:
-        - TOXENV=py36-dj20-postgres-xdist-coverage
+        - TOXENV=py36-dj30-postgres-xdist-coverage
         # Test in verbose mode.
         - PYTEST_ADDOPTS=-vv
       services:
