Use property instead of property-read

Author: ceesgeene

stubs/Drupal/datetime_range/Plugin/Field/FieldType/DateRangeItem.stub

@@ -5,12 +5,12 @@ namespace Drupal\datetime_range\Plugin\Field\FieldType;
 use Drupal\datetime\Plugin\Field\FieldType\DateTimeItem;
 
 /**
- * @property-read null $date
+ * @property null $date
  *   Even though this extends DateTimeItem, the date property does not actually
  *   exist. It is not possible to undo a property definition.
- * @property-read ?\Drupal\Core\Datetime\DrupalDateTime $start_date
+ * @property ?\Drupal\Core\Datetime\DrupalDateTime $start_date
  * @property ?string $end_value
- * @property-read ?\Drupal\Core\Datetime\DrupalDateTime $end_date
+ * @property ?\Drupal\Core\Datetime\DrupalDateTime $end_date
  */
 class DateRangeItem extends DateTimeItem {