Add Django 2.0 to travis

.travis.yml

@@ -31,17 +31,24 @@ matrix:
      python: 3.6
    - env: TOXENV=py36-dj111-mysql-noelasticsearch
      python: 3.6
+   - env: TOXENV=py36-dj20-postgres-noelasticsearch
+     python: 3.6
    - env: TOXENV=py36-dj111-postgres-elasticsearch2 INSTALL_ELASTICSEARCH2=yes
      python: 3.6
      sudo: true
    - env: TOXENV=py36-dj111-postgres-elasticsearch5 INSTALL_ELASTICSEARCH5=yes
      python: 3.6
      sudo: true
+   - env: TOXENV=py36-dj20-postgres-elasticsearch5 INSTALL_ELASTICSEARCH5=yes
+     python: 3.6
+     sudo: true
   allow_failures:
+    - env: TOXENV=py36-dj20-postgres-noelasticsearch
     # Ignore failures on Elasticsearch tests because ES on Travis is intermittently flaky
     - env: TOXENV=py35-dj111-postgres-elasticsearch2 INSTALL_ELASTICSEARCH2=yes
     - env: TOXENV=py36-dj111-postgres-elasticsearch2 INSTALL_ELASTICSEARCH2=yes
     - env: TOXENV=py36-dj111-postgres-elasticsearch5 INSTALL_ELASTICSEARCH5=yes
+    - env: TOXENV=py36-dj20-postgres-elasticsearch5 INSTALL_ELASTICSEARCH5=yes
 
 # Services
 services:

tox.ini

@@ -2,7 +2,7 @@
 skipsdist = True
 usedevelop = True
 
-envlist = py{34,35,36}-dj111-{sqlite,postgres,mysql,mssql}-{elasticsearch5,elasticsearch2,noelasticsearch},
+envlist = py{34,35,36}-dj{111,20}-{sqlite,postgres,mysql,mssql}-{elasticsearch5,elasticsearch2,noelasticsearch},
 
 [flake8]
 # D100: Missing docstring in public module
@@ -41,6 +41,9 @@ deps =
 
     dj111: Django>=1.11b1,<2.0
     dj111-mssql: django-pyodbc-azure==1.11.0.0
+    dj20: Django==2.0rc1
+    dj20: git+https://github.com/jdufresne/django-taggit.git@dj20
+    dj20: git+https://github.com/wagtail/django-modelcluster.git
     postgres: psycopg2>=2.6
     mysql: mysqlclient==1.3.6
     elasticsearch2: elasticsearch>=2,<3