Fix formatting

Author: GromNaN

generator/src/FluentStageFactoryGenerator.php

@@ -157,7 +157,7 @@ private function addMethod(Method $factoryMethod, PhpNamespace $namespace, Class
             PHP,
             'Stage',
             $factoryMethod->getName(),
-            implode(',', $args),
+            implode(', ', $args),
         ));
     }
 }