Remove \Throwable support deprecation layer

Author: fancyweb

DataCollector/NotificationDataCollector.php

@@ -22,7 +22,7 @@
  *
  * @experimental in 5.0
  */
-class NotificationDataCollector extends DataCollector
+final class NotificationDataCollector extends DataCollector
 {
     private $logger;
 
@@ -34,7 +34,7 @@ public function __construct(NotificationLoggerListener $logger)
     /**
      * {@inheritdoc}
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response, \Throwable $exception = null)
     {
         $this->data['events'] = $this->logger->getEvents();
     }

composer.json

@@ -18,6 +18,9 @@
     "require": {
         "php": "^7.2.9"
     },
+    "conflict": {
+        "symfony/http-kernel": "<4.4"
+    },
     "autoload": {
         "psr-4": { "Symfony\\Component\\Notifier\\": "" },
         "exclude-from-classmap": [