port doc build fixes from FOSHttpCacheBundle to this library

FriendsOfSymfony/FOSHttpCacheBundle#496

Author: dbu

doc/conf.py

@@ -30,7 +30,9 @@
 extensions = [
     'sphinx.ext.coverage',
     'sphinx.ext.extlinks',
+    'sphinxcontrib.phpdomain',
     'sensio.sphinx.configurationblock',
+    'sensio.sphinx.phpcode',
     'sphinxcontrib.spelling'
 ]
 
@@ -52,7 +54,7 @@
 
 # General information about the project.
 project = 'FOSHttpCache'
-copyright = u'2014–2016, FriendsOfSymfony'
+copyright = u'2014–2018, FriendsOfSymfony'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the

doc/requirements.txt

@@ -1,4 +1,5 @@
 git+https://github.com/fabpot/sphinx-php.git
-sphinx-rtd-theme==0.1.6
+sphinx-rtd-theme
 sphinxcontrib-spelling
+sphinxcontrib-phpdomain
 pyenchant