change namespace and cleanup code

src/Accounts/Exceptions/RequestRequiresClientIdException.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Bitinflow\Accounts\Exceptions;
+
+use Exception;
+
+/**
+ * @author René Preuß <rene@preuss.io>
+ */
+class RequestRequiresClientIdException extends Exception
+{
+    public function __construct($message = 'Request requires Client-ID', $code = 0, Exception $previous = null)
+    {
+        parent::__construct($message, $code, $previous);
+    }
+}