Update user-agent header

Author: Gared

src/Service/ScannerService.php

@@ -50,7 +50,7 @@ public function __construct(
             'timeout' => 2.0,
             'connect_timeout' => 2.0,
             RequestOptions::HEADERS => [
-                'User-Agent' => 'EtherpadScanner/2.1.0',
+                'User-Agent' => 'EtherpadScanner/3.0.0',
             ],
             'handler' => $stack,
             'verify' => false,