third attempt at deploying docs

.travis.yml

@@ -4,6 +4,10 @@ dist: xenial    # required for Python 3.7 (travis-ci/travis-ci#9069)
 python: "3.7"
 cache: pip
 
+addons:
+  apt:
+    packages:
+      - python3-sphinx
 install:
   - pip install --upgrade pip
   - pip install -r requirements.txt
@@ -17,6 +21,8 @@ script:
   - python setup.py test
   - python setup.py bdist_wheel
 after_success:
+  - pip install sphinx_rtd_theme
+  - make --directory docs/ html
   - openssl aes-256-cbc -K $encrypted_1b28e850a424_key -iv $encrypted_1b28e850a424_iv -in travis/crypt.enc -out travis/crypt -d
   - tar xf travis/crypt
   - test $TRAVIS_BRANCH = "master" && test $TRAVIS_PULL_REQUEST = "false" && travis/deploy_docs.sh