update websocket client code

Author: ylebre

solid/lib/Notifications/SolidPubSub.php

@@ -14,14 +14,10 @@ public function __construct($pubsubUrl) {
         public function send($path, $type) {
             $pubsub = str_replace(["https://", "http://"], "wss://", $this->pubsub);
 
-            $client = new Client($pubsub, array(
-                'headers' => array(
-                    'Sec-WebSocket-Protocol' => 'solid-0.1'
-                )
-            ));
-
+            $client = new Client($pubsub);
+            $client->addHeader("Sec-WebSocket-Protocol", "solid-0.1");
             try {
-                $client->send("pub $path\n");
+                $client->text("pub $path\n");
             } catch (\WebSocket\Exception $exception) {
                 throw new \Exception('Could not write to pubsub server', 502, $exception);
             }