add event

src/Events/ChannelVacated.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace BeyondCode\LaravelWebSockets\Events;
+
+class ChannelVacated
+{
+    /** @var \BeyondCode\LaravelWebSockets\Events\ConnectionInterface */
+    protected $connection;
+
+    /** @var string */
+    protected $channelId;
+
+    public function __construct(ConnectionInterface $connection, string $channelId)
+    {
+        $this->connection = $connection;
+
+        $this->channelId = $channelId;
+    }
+}