British Virgin Islands IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "VG",
    ...>    check_digits: "96",
    ...>    bank_code: "VPVG",
    ...>    branch_code: nil,
    ...>    national_check: nil,
    ...>    account_number: "0000012345678901"
    ...>  }
    ...>  |> IbanEx.Country.VG.to_string()
    "VG 96 VPVG 0000012345678901"