Remove debug output

src/Client.php

@@ -77,7 +77,6 @@ final class Client {
         ), function (string $class) {
             return class_implements($class, AbstractPostSerializable::class) && strpos($class, AbstractPostSerializable::class) !== 0;
         });
-        var_dump($classes);
 
         $key = array_search(strtolower($ns), array_map(function (string $class): string {
             return $class::namespace();