Fix dev namespace

Author: thefeqy

tests/Pest.php

@@ -11,7 +11,7 @@
 |
 */
 
-// pest()->extend(Tests\TestCase::class)->in('Feature');
+// pest()->extend(GrokPHP\Client\Tests\TestCase::class)->in('Feature');
 
 /*
 |--------------------------------------------------------------------------

tests/TestCase.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Tests;
+namespace GrokPHP\Client\Tests;
 
 use PHPUnit\Framework\TestCase as BaseTestCase;