Merge pull request #99 from FriendsOfSymfony/strict_sphinx

Run Sphinx in strict mode on Travis

Author: dbu

.travis.yml

@@ -38,7 +38,7 @@ before_script:
 
 script:
   - phpunit --coverage-clover=coverage.clover
-  - make -C doc html
+  - make -C doc SPHINXOPTS='-nW' html
 
 after_script:
   - wget https://scrutinizer-ci.com/ocular.phar