* Add sql upgrade file for 2.8.12

www/install/sql/centreon/Update-DB-2.8.11_to_2.8.12.sql

+-- Change version of Centreon
+UPDATE `informations` SET `value` = '2.8.12' WHERE CONVERT( `informations`.`key` USING utf8 ) = 'version' AND CONVERT ( `informations`.`value` USING utf8 ) = '2.8.11' LIMIT 1;