Remove Symfony 3 compatibility code.

derrabus · derrabus · commit e48b25a48a73 · 2020-10-30T15:21:36.000+01:00
diff --git a/Request.php b/Request.php
@@ -179,7 +179,7 @@ class Request
     protected $format;
 
     /**
-     * @var SessionInterface
+     * @var SessionInterface|callable
      */
     protected $session;
 
