Release 3.1.8

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
 
-* 3.1.8 (Unreleased)
+* 3.1.8 (2016-01-07)
  * Removes store:true from mappings unless specifically defined
 
 * 3.1.7 (2015-12-08)