Return the response after sending the message

Laravel's notification sender (`Illuminate\Notifications\NotificationSender`) dispatches an event (`Illuminate\Notifications\Events\NotificationSent`) after the message has been sent.
This event contains the response returned from the specific notification channel. When no response is returned, this event's response attribute contains `null`.

However, this information could be useful - for logging purposes, for pairing the notification messages with the users etc.

Author: pavoltanuska

src/OneSignalChannel.php

@@ -23,6 +23,7 @@ public function __construct(OneSignalClient $oneSignal)
      * @param mixed $notifiable
      * @param \Illuminate\Notifications\Notification $notification
      *
+     * @return \Psr\Http\Message\ResponseInterface
      * @throws \NotificationChannels\OneSignal\Exceptions\CouldNotSendNotification
      */
     public function send($notifiable, Notification $notification)
@@ -45,5 +46,7 @@ public function send($notifiable, Notification $notification)
         if ($response->getStatusCode() !== 200) {
             throw CouldNotSendNotification::serviceRespondedWithAnError($response);
         }
+
+        return $response;
     }
 }