Make Embeddable not transient

Author: malarzm

lib/Doctrine/ORM/Mapping/Driver/AnnotationDriver.php

@@ -44,6 +44,7 @@ class AnnotationDriver extends AbstractAnnotationDriver
     protected $entityAnnotationClasses = [
         Mapping\Entity::class => 1,
         Mapping\MappedSuperclass::class => 2,
+        Mapping\Embeddable::class => 3,
     ];
 
     /**