Merge pull request #80 from SergeC/patch-1

Fix return type for isRequired to match Symfony Form return type

Author: tacman

src/Limenius/Liform/Transformer/AbstractTransformer.php

@@ -28,7 +28,7 @@ public function __construct(protected TranslatorInterface $translator, protected
     {
     }
 
-    public function isRequired(FormInterface $form): bool
+    public function isRequired(FormInterface $form): ?bool
     {
         return $form->getConfig()->getOption('required');
     }