Croatia IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "HR",
    ...>    check_digits: "12",
    ...>    bank_code: "1001005",
    ...>    branch_code: nil,
    ...>    national_check: nil,
    ...>    account_number: "1863000160"
    ...>  }
    ...>  |> IbanEx.Country.HR.to_string()
    "HR 12 1001005 1863000160"