Add release config.

Fix https://github.com/jazzband-roadies/help/issues/201.

.travis.yml

@@ -1,12 +1,34 @@
 language: python
 dist: bionic
 python:
-  - 3.6
-  - 3.7
-  - 3.8
-  - 3.9-dev
+- 3.6
+- 3.7
+- 3.8
+- 3.9-dev
 install:
-  - pip install tox
-  - pip install -q tox-travis
+- pip install tox tox-travis
 script:
-  - tox
+- tox -v
+jobs:
+  fast_finish: true
+  include:
+    - stage: deploy
+      env:
+      python: 3.7
+      script: skip
+      deploy:
+        provider: pypi
+        user: jazzband
+        server: https://jazzband.co/projects/django-downloadview/upload
+        distributions: sdist bdist_wheel
+        password:
+          secure: TYFfz5OkSH0YwTKh0lc0PbddcuZh5oL2H1AVIXHs2dODQ46PNgLYgDRe9k9PItAenxm7QCnGRONJo2o1GNuiCcAOWK84jbrmufHZ5EeKTOVtssyrffSA/Oxfs5mFJ/Kgy3o8FC1hGRKXrXFN3bvedmVHERGQimQESPxHQ9sPWhc=
+        skip_existing: true
+        skip_cleanup: true
+        on:
+          tags: true
+          repo: jazzband/django-downloadview
+          python: 3.7
+after_success:
+  - pip install coveralls
+  - coveralls

tox.ini

@@ -18,7 +18,6 @@ commands =
     pip install -e .
     pip install -e demo
     python -Wd {envbindir}/demo test --cover-package=django_downloadview --cover-package=demoproject {posargs: tests demoproject}
-    coverage erase
     pip freeze
 
 [testenv:flake8]