Kosovo IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "XK",
    ...>    check_digits: "05",
    ...>    bank_code: "12",
    ...>    branch_code: "12",
    ...>    national_check: "06",
    ...>    account_number: "0123456789"
    ...>  }
    ...>  |> IbanEx.Country.XK.to_string()
    "XK 05 12 12 0123456789 06"