Change done function to throw UnsupportedException

src/Api/Api.php

@@ -15,6 +15,7 @@
 
 namespace Katana\Sdk\Api;
 use Katana\Sdk\Component\Component;
+use Katana\Sdk\Exception\UnsupportedException;
 use Katana\Sdk\Logger\RequestKatanaLogger;
 use Katana\Sdk\Schema\Mapping;
 use Katana\Sdk\Schema\ServiceSchema;
@@ -238,6 +239,6 @@ public function getServiceSchema(
      */
     public function done(): bool
     {
-        return false;
+        throw new UnsupportedException('SDK does not support async call to end action: Api.done()');
     }
 }

src/Exception/UnsupportedException.php

@@ -0,0 +1,21 @@
+<?php
+/**
+ * PHP 7 SDK for the KATANA(tm) Framework (http://katana.kusanagi.io)
+ * Copyright (c) 2016-2017 KUSANAGI S.L. All rights reserved.
+ *
+ * Distributed under the MIT license
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code
+ *
+ * @link      https://github.com/kusanagi/katana-sdk-php7
+ * @license   http://www.opensource.org/licenses/mit-license.php MIT License
+ * @copyright Copyright (c) 2016-2017 KUSANAGI S.L. (http://kusanagi.io)
+ */
+
+namespace Katana\Sdk\Exception;
+
+class UnsupportedException extends \RuntimeException
+{
+
+}