Editar data de vencimento da cobrança

Example response

{
  "id": "ch_9R6419s6Btvp4ykO",
  "code": "R8VI5WU79R",
  "gateway_id": "efda8d57-50d8-4b19-b2d4-873bee2e1b62",
  "amount": 14900000,
  "status": "pending",
  "currency": "BRL",
  "payment_method": "boleto",
  "due_at": "2017-04-04T00:00:00",
  "created_at": "2017-04-04T21:34:32",
  "updated_at": "2017-04-04T21:44:05",
  "customer": {
    "id": "cus_aEkwKv0SmNHMR931",
    "name": "Luke Skywalker",
    "email": "lskywalker@r2d2.com",
    "created_at": "2017-04-04T19:41:31",
    "updated_at": "2017-04-04T19:41:31"
  },
  "last_transaction": {
    "id": "tran_E3r7OrMh3hbjvwKj",
    "transaction_type": "boleto",
    "gateway_id": "19372a76-a8de-4017-aa91-8c9d21c34185",
    "amount": 14900000,
    "status": "generated",
    "success": true,
    "url": "https://sandbox.mundipaggone.com/Boleto/ViewBoleto.aspx?19372a76-a8de-4017-aa91-8c9d21c34185",
    "pdf": "https://api.mundipagg.com/core/v1.0/transactions/tran_E3r7OrMh3hbjvwKj/pdf",
    "line": "34191.75009 03073.581237 41234.510000 2 71240014900000",
    "barcode": "https://api.mundipagg.com/core/v1.0/transactions/tran_E3r7OrMh3hbjvwKj/barcode",
    "qr_code": "https://api.mundipagg.com/core/v1.0/transactions/tran_E3r7OrMh3hbjvwKj/qrcode",
    "nosso_numero": "00030735",
    "bank": "001",
    "document_number": "094408333",
    "created_at": "2017-04-04T21:44:05",
    "updated_at": "2017-04-04T21:44:05"
  },
  "metadata": {
    "id": "my_charge_id"
  }
}