fix: Session은 singleton이므로 생성자가 public이면 안됨

src/sammo/DummySession.php

@@ -26,7 +26,7 @@ class DummySession extends Session
     }
 
 
-    public function __construct()
+    protected function __construct()
     {
         $this->set('userID', -1);
         $this->set('userName', 'Dummy');