Romania IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "RO",
    ...>    check_digits: "49",
    ...>    bank_code: "AAAA",
    ...>    branch_code: nil,
    ...>    national_check: nil,
    ...>    account_number: "1B31007593840000"
    ...>  }
    ...>  |> IbanEx.Country.RO.to_string()
    "RO 49 AAAA 1B31007593840000"