Remove typehint from marshalControllerNotFoundEvent

- Removes the tyephint for the `$exception` argument, to allow either
  `Exception` or `Throwable` to be provided.

Author: Maarten van Middelaar

src/DispatchListener.php

@@ -176,15 +176,15 @@ protected function complete($return, MvcEvent $event)
      * @param  string $controllerName
      * @param  MvcEvent $event
      * @param  Application $application
-     * @param  \Exception $exception
+     * @param  \Throwable|\Exception $exception
      * @return mixed
      */
     protected function marshalControllerNotFoundEvent(
         $type,
         $controllerName,
         MvcEvent $event,
         Application $application,
-        \Exception $exception = null
+        $exception = null
     ) {
         $event->setName(MvcEvent::EVENT_DISPATCH_ERROR);
         $event->setError($type);