updated .travis & .readthedocs yml

.readthedocs.yml

@@ -1,2 +1,4 @@
+python:
+    version: 3
 requirements_file: requirements.txt
 

.travis.yml

@@ -16,15 +16,17 @@ deploy:
   provider: releases
   api_key: $GITHUB_TOKEN
   file_glob: true
-  file: bundles/*
+  file: $TRAVIS_BUILD_DIR/bundles/*
   skip_cleanup: true
+  overwrite: true
   on:
     tags: true
 
 install:
-  - pip install pylint circuitpython-build-tools
+  - pip install pylint circuitpython-build-tools Sphinx sphinx-rtd-theme
 
 script:
   - pylint adafruit_ds3231.py
   - ([[ ! -d "examples" ]] || pylint --disable=missing-docstring,invalid-name examples/*.py)
   - circuitpython-build-bundles --filename_prefix adafruit-circuitpython-ds3231 --library_location .
+  - cd docs && sphinx-build -E -W -b html . _build/html