Sweden IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "SE",
    ...>    check_digits: "45",
    ...>    bank_code: "500",
    ...>    branch_code: nil,
    ...>    national_check: nil,
    ...>    account_number: "00000058398257466"
    ...>  }
    ...>  |> IbanEx.Country.SE.to_string()
    "SE 45 500 00000058398257466"