Call to undefined method Berkayk\OneSignal\OneSignalFacade::send()

I am using Laravel 5.8 and v1.0 of this plugin. when I test it out with the code on read me I am getting this error : Call to undefined method Berkayk\OneSignal\OneSignalFacade::send()

Here is my notification file config

//Import
use OneSignal;

public function __construct($ticket)
    {
        $this->ticket = $ticket;
    }

public function via($notifiable)
    {
        return ['mail', 'database','OneSignal'];
    }

 public function toOneSignal($notifiable)
    {
        \OneSignal::sendNotificationUsingTags(
            "Some Message",
            array(toArray(["key" => "company_id", "relation" => "=", "value" => $this->ticket->company_id])),
            $url = null,
            $data = null,
            $buttons = null,
            $schedule = null
        );
    }

via Chebli Mohamed