assignee_status field in Task causing deprecation warning

[Sph3ricalPeter]

As per https://forum.asana.com/t/upcoming-changes-coming-to-my-tasks-in-asana-breaking-changes/96493, Task should no longer contain the assigneeStatus field.

Currently, requesting a task via client.tasks.getTask(taskId) will log a warning: This request is affected by the "new_user_task_lists" deprecation. Please visit this url for more info: https://forum.asana.com/t/update-on-our-planned-api-changes-to-user-task-lists-a-k-a-my-tasks/103828 Adding "new_user_task_lists" to your "Asana-Enable" or "Asana-Disable" header will opt in/out to this deprecation and suppress this warning.