Updated a missing client namespace addition

Author: WyriHaximus

tests/ApiSettingsTest.php

@@ -1,7 +1,6 @@
-<?php
-declare(strict_types=1);
+<?php declare(strict_types=1);
 
-namespace ApiClients\Tests\Pusher;
+namespace ApiClients\Tests\Client\Pusher;
 
 use ApiClients\Client\Pusher\ApiSettings;
 use ApiClients\Tools\TestUtilities\TestCase;