Release 3.1.0

Author: merk

CHANGELOG-3.1.md

@@ -9,7 +9,7 @@ https://github.com/FriendsOfSymfony/FOSElasticaBundle/commit/XXX where XXX is
 the commit hash. To get the diff between two versions, go to
 https://github.com/FriendsOfSymfony/FOSElasticaBundle/compare/v3.0.4...v3.1.0
 
-* 3.1.0 (Unreleased)
+* 3.1.0 (2015-03-18)
 
  * BC BREAK: `Doctrine\Listener#scheduleForDeletion` access changed to private.
  * BC BREAK: `ObjectPersisterInterface` gains the method `handlesObject` that