Merge pull request #39 from force-h2020/35-use-make-html-in-travis

Using make html to create the docs

.travis.yml

@@ -22,7 +22,9 @@ script:
     - flake8 .
     - python -m unittest discover
     - pip install -r requirements/doc_requirements.txt
-    - sphinx-build -W doc/source doc/build/sphinx
+    - pushd doc
+    - make html
+    - popd
 after_success:
     - coverage run -m unittest discover
     - pip install codecov