Add pypi uploads (#10)

Author: eric-wieser

.travis.yml

@@ -2,10 +2,17 @@ language: python
 sudo: false
 cache: pip
 python:
-- 3.5
 - 3.6
 - 3.7
+- 3.8
 install:
 - pip install tox-travis
 script:
 - tox
+deploy:
+  provider: pypi
+  user: __token__
+  password: ${PYPI_PASSWORD}
+  on:
+    tags: true
+    condition: "$TRAVIS_PYTHON_VERSION == 3.8"