"orders/{:order_id}/holds" link is missing

[kyungmin]

If the user creates a hold referencing to an order, there's no way to view the new hold from the orders page.

{
  "orders": [
  {
    "links": {
      "orders.merchant": "/customers/{orders.merchant}",
      "orders.credits": "/orders/{orders.id}/credits",
      "orders.reversals": "/orders/{orders.id}/reversals",
      "orders.events": "/orders/{orders.id}/events",
      "orders.refunds": "/orders/{orders.id}/refunds",
      "orders.debits": "/orders/{orders.id}/debits",
      "orders.buyers": "/orders/{orders.id}/buyers"
    }
  }
  ]
}