Fix namespace for PaymentCommand class

Author: ErfanBahramali

Commands/Payments/GenericmessageCommand.php

@@ -19,6 +19,7 @@
 namespace Longman\TelegramBot\Commands\SystemCommands;
 
 use Longman\TelegramBot\Commands\SystemCommand;
+use Longman\TelegramBot\Commands\UserCommands\PaymentCommand;
 use Longman\TelegramBot\Entities\ServerResponse;
 use Longman\TelegramBot\Request;