refactor: chrono objects

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

shared/lib/Chrono/Entity/Property/TaskSubtaskCollection.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace KTXF\Chrono\Entity\Property;
+
+use KTXF\Json\JsonSerializableCollection;
+
+class TaskSubtaskCollection extends JsonSerializableCollection {
+    public function __construct(array $data = []) {
+        parent::__construct($data, TaskSubtaskObject::class, 'string');
+    }
+}