Style the versionadded Sphinx directive

Author: ddeboer

doc/_static/fos.css

@@ -0,0 +1,3 @@
+.versionmodified {
+    font-weight: bold;
+}

doc/conf.py

@@ -132,6 +132,7 @@
 def setup(app):
     app.add_javascript('tabs.js')
     app.add_stylesheet('tabs.css')
+    app.add_stylesheet('fos.css')
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.

doc/invalidation-handlers.rst

@@ -10,7 +10,6 @@ Tag Handler
 -----------
 
 .. versionadded:: 1.3
-
     The tag handler was added in FOSHttpCache 1.3. If you are using an older
     version of the library and can not update, you need to use
     ``CacheInvalidator::invalidateTags``.