Add PyPI deployment

.travis.yml

@@ -6,3 +6,13 @@ python:
 script:
 - pip install -U pytest
 - python setup.py test
+deploy:
+  provider: pypi
+  on:
+    tags: true
+    all_branches: true
+  user: jaraco
+  provider: pypi
+  # supply password with `travis encrypt --add deploy.password`
+  distributions: release
+  python: 3.5