replace Parameter\Checker with Parameter\Validator

Controller.php

@@ -2,7 +2,7 @@
 abstract class Controller {
     protected function checkParameters(array $parameters, array $options) {
         try {
-            (new \Owl\Parameter\Checker)->execute($parameters, $options);
+            (new \Owl\Parameter\Validator)->execute($parameters, $options);
         } catch (\Owl\Parameter\Exception $exception) {
             throw \Owl\Http\Exception::factory(400, $exception);
         }