UpdateWorkItemRequest

部分更新请求体。仅传需要修改的字段。内容层（content/due_at）仅 self 来源可改，推送项传入返回 4015；态度层（tag_id/status/remind_at）全来源可改。

{
    "content": "string",
    "due_at": "2019-08-24T14:15:22.123Z",
    "tag_id": 0,
    "status": "pending",
    "remind_at": "2019-08-24T14:15:22.123Z"
}