symfony 3.1 deprecations must be fixed

[warp16team]

Remaining deprecation notices (3)

Not quoting the scalar "%doctrine_set_type.set_type_guesser.class%" starting with the "%" indicator character is deprecated since Symfony 3.1 and will throw a ParseException in 4.0: 1x
1x in AppKernel::boot

Not quoting the scalar "%doctrine.dbal.connection_factory.types%" starting with the "%" indicator character is deprecated since Symfony 3.1 and will throw a ParseException in 4.0: 1x
1x in AppKernel::boot

Not quoting the scalar "%doctrine_set_type.set_type.class_name%" starting with the "%" indicator character is deprecated since Symfony 3.1 and will throw a ParseException in 4.0: 1x
1x in AppKernel::boot

[warp16team]

diff --git a/Resources/config/services.yml b/Resources/config/services.yml
index f553d8c..5d5d5f4 100644
--- a/Resources/config/services.yml
+++ b/Resources/config/services.yml
@@ -4,7 +4,7 @@ parameters:
 
 services:
     doctrine_set_type.set_type_guesser:
-        class: %doctrine_set_type.set_type_guesser.class%
-        arguments: ["@doctrine", %doctrine.dbal.connection_factory.types%, %doctrine_set_type.set_type.class_name%]
+        class: "%doctrine_set_type.set_type_guesser.class%"
+        arguments: ["@doctrine", "%doctrine.dbal.connection_factory.types%", "%doctrine_set_type.set_type.class_name%"]
         tags:
             - { name: form.type_guesser }