fixup! [ADD] test building docs

.travis.yml

@@ -13,14 +13,14 @@ python:
 addons:
   apt:
     packages:
-      - python-sphinx
       - realpath
 
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
 install:
     - pip install -r requirements.txt
     - if [ "$TRAVIS_PYTHON_VERSION" == "2.7" ]; then pip install -r https://raw.githubusercontent.com/OCA/OCB/8.0/requirements.txt; fi
     - if [ "$TRAVIS_PYTHON_VERSION" == "2.7" ]; then pip install -r https://raw.githubusercontent.com/OCA/OCB/9.0/requirements.txt; fi
+    - if [ "$TRAVIS_PYTHON_VERSION" == "2.7" ]; then pip install sphinx; fi
 
 # command to run tests, e.g. python setup.py test
 script: