Change HTTP Status Code on Validation ex (dingo#1532)

* Change HTTP Status Code on Validation ex

ValidationException has status code for response but does not implement HttpExceptionInterface 
status code by default is 422 but can change in

* Fixed StyleCI

Author: SamsamBabadi

src/Exception/Handler.php

@@ -180,6 +180,10 @@ protected function genericResponse(Exception $exception)
      */
     protected function getStatusCode(Exception $exception)
     {
+        if ($exception instanceof ValidationException) {
+            return $exception->status;
+        }
+
         return $exception instanceof HttpExceptionInterface ? $exception->getStatusCode() : 500;
     }