Italy IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "IT",
    ...>    check_digits: "60",
    ...>    bank_code: "05428",
    ...>    branch_code: "11101",
    ...>    national_check: "X",
    ...>    account_number: "000000123456"
    ...>  }
    ...>  |> IbanEx.Country.IT.to_string()
    "IT 60 X 05428 11101 000000123456"