improve logging

Reviewed-on: #49

src/Subcriber.php

@@ -25,6 +25,6 @@ class Subcriber implements EventSubscriberInterface
 
     public function logException(ExceptionEvent $event): void
     {
-        $this->logger->warning($event->getThrowable()->getMessage());
+        $this->logger->error($event->getThrowable()->getMessage());
     }
 }