Update travis for Python 3.6

.travis.yml

@@ -5,19 +5,27 @@ python:
   - "3.3"
   - "3.4"
   - "3.5"
+  - "3.6"
 env:
   - REQUIREMENTS="django>=1.8,<1.9"
   - REQUIREMENTS="django>=1.9,<1.10"
   - REQUIREMENTS="django>=1.10,<1.11"
+  - REQUIREMENTS="django>=1.11,<2.0"
   - REQUIREMENTS="https://github.com/django/django/archive/master.tar.gz"
 matrix:
   exclude:
+    - python: "2.7"
+      env:  REQUIREMENTS="django>=1.11,<2.0"
     - python: "3.3"
       env: REQUIREMENTS="https://github.com/django/django/archive/master.tar.gz"
     - python: "3.3"
       env: REQUIREMENTS="django>=1.9,<1.10"
     - python: "3.3"
       env: REQUIREMENTS="django>=1.10,<1.11"
+    - python: "3.3"
+      env: REQUIREMENTS="django>=1.11,<2.0"
+    - python: "3.4"
+      env: REQUIREMENTS="django>=1.11,<2.0"
     - python: "3.5"
       env: REQUIREMENTS="django>=1.7,<1.8"
     - python: "3.5"

tests/__init__.py

@@ -1,7 +1,14 @@
 import os
 
-from django.test.utils import setup_test_environment
+from django.test.utils import setup_test_environment, teardown_test_environment
 
 
 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "settings")
+
+try:
+    # Prevent if setup_test_environment has been called previously
+    teardown_test_environment()
+except AttributeError:
+    pass
+
 setup_test_environment()