Quote value with "%"

Is deprecated with SF 3

Author: notFloran

src/Resources/config/services.yml

@@ -24,7 +24,7 @@ services:
     hexanet_monolog_extra.logger.provider.session.symfony:
         class: Hexanet\Common\MonologExtraBundle\Provider\Session\SymfonySessionIdProvider
         arguments:
-          - %hexanet_monolog_extra.session_start%
+          - "%hexanet_monolog_extra.session_start%"
           - "@?session"
 
     hexanet_monolog_extra.logger.provider.user.symfony: