[MsgPhpEavBundle] enable doctrine mapping

msgphp/eav-bundle/0.2/src/Entity/Eav/Attribute.php

@@ -2,14 +2,16 @@
 
 namespace App\Entity\Eav;
 
+use Doctrine\ORM\Mapping as ORM;
 use MsgPhp\Eav\AttributeIdInterface;
 use MsgPhp\Eav\Entity\Attribute as BaseAttribute;
 
 /**
- * @final
+ * @ORM\Entity()
  */
 class Attribute extends BaseAttribute
 {
+    /** @ORM\Id @ORM\Column(type="msgphp_attribute_id") */
     private $id;
 
     public function __construct(AttributeIdInterface $id)