Test against Python 3.8 dev build

.travis.yml

@@ -27,6 +27,8 @@ matrix:
      python: 3.7
    - env: TOXENV=py37-djmaster-postgres-noelasticsearch
      python: 3.7
+   - env: TOXENV=py38-dj22-postgres-noelasticsearch
+     python: 3.8-dev
    - env: TOXENV=py36-dj20-sqlite-elasticsearch2 INSTALL_ELASTICSEARCH2=yes
      python: 3.6
    - env: TOXENV=py36-dj21-sqlite-elasticsearch2 INSTALL_ELASTICSEARCH2=yes
@@ -51,6 +53,8 @@ matrix:
     - env: TOXENV=py37-dj22stable-postgres-noelasticsearch
     # allow failures against Django master
     - env: TOXENV=py37-djmaster-postgres-noelasticsearch
+    # allow failures against Python 3.8-dev
+    - env: TOXENV=py38-dj22-postgres-noelasticsearch
 
 # Services
 services:

tox.ini

@@ -36,6 +36,7 @@ basepython =
     py35: python3.5
     py36: python3.6
     py37: python3.7
+    py38: python3.8
 
 deps =
     django-sendfile==0.3.6