Fixes for Travis.

.travis.yml

@@ -1,5 +1,6 @@
 services:
   - redis-server
+dist: xenial
 sudo: false
 language: python
 python:

tests/constraints/flask-1.0.txt

@@ -0,0 +1 @@
+Flask<2.0

tests/requirements.txt

@@ -7,7 +7,7 @@ pytest-django
 pytest-mock
 pytest-pythonpath
 mock
-redis
+redis<3.2.0
 django-redis
 fakeredis
 jsonschema

tox.ini

@@ -2,15 +2,14 @@
 usedevelop = True
 minversion = 1.8
 envlist =
-    lint,
+    py36-lint,
+    py36-dj{18,19,110,111,20}-docs,
     # the version matrix according to the Django docs:
     # https://docs.djangoproject.com/en/2.0/faq/install/#what-python-version-can-i-use-with-django
-    docs-py35-dj{18,19,110,111,20},
-    tests-py{27,34,35}-dj18,
-    tests-py{27,34,35}-dj{19,110},
-    tests-py{27,34,35,36}-dj111,
-    tests-py{34,35,36}-dj20,
-    tests-py{27,34,35,36}-fl{011,012}
+    py{27,34,35}-dj{18,19,110}-tests,
+    py{27,34,35,36}-dj111-tests,
+    py{34,35,36}-dj20-tests,
+    py{27,34,35,36}-fl{011,012,10}-tests,
 
 [testenv]
 basepython =
@@ -30,6 +29,7 @@ deps =
     dj111: -ctests/constraints/django-1.11.txt
     fl011: -ctests/constraints/flask-0.11.txt
     fl012: -ctests/constraints/flask-0.12.txt
+    fl10: -ctests/constraints/flask-1.0.txt
 commands =
     python --version
     tests: pytest {posargs:tests}