Pass the previous exception.

Author: mvdnbrk

src/Exceptions/DhlParcelException.php

@@ -34,16 +34,15 @@ public function __construct(string $message = '', int $code = 0, ResponseInterfa
      *  Create a new DhlParcelException instance from the given Guzzle request exception.
      *
      * @param  \GuzzleHttp\Exception\RequestException  $exception
-     * @param  \Throwable|null  $previous
      * @return static
      */
-    public static function createFromGuzzleRequestException(RequestException $exception, Throwable $previous = null)
+    public static function createFromGuzzleRequestException(RequestException $exception)
     {
         return new static(
             $exception->getMessage(),
             $exception->getCode(),
             $exception->getResponse(),
-            $previous
+            $exception
         );
     }