add Django 2.0 to test matrix

.travis.yml

@@ -8,6 +8,11 @@ env:
 - DJANGO="django>=1.9.0,<1.10.0"
 - DJANGO="django>=1.10.0,<1.11.0"
 - DJANGO="django>=1.11.0,<1.12.0"
+- DJANGO="django>=2.0,<2.1"
+matrix:
+  exclude:
+  - python: 2.7
+    env: DJANGO="django>=2.0,<2.1"
 before_install:
 - pip install codecov
 install:

tox.ini

@@ -2,6 +2,7 @@
 envlist=
     py27-django{18,19,110,111},
     py36-django{18,19,110,111},
+    py36-django{20},
     # py36-django-dev,
     coverage,
 
@@ -13,6 +14,7 @@ deps =
     django19: Django >= 1.9,<1.10
     django110: Django >= 1.10,<1.11
     django111: Django >= 1.11,<1.12
+    django20: Django >= 2.0,<2.1
     django-dev: https://github.com/django/django/tarball/master
 commands=
     python runtests.py