Djibouti IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "DJ",
    ...>    check_digits: "21",
    ...>    bank_code: "00010",
    ...>    branch_code: "00000",
    ...>    account_number: "01540001001",
    ...>    national_check: "86"
    ...>  }
    ...>  |> IbanEx.Country.DJ.to_string()
    "DJ 21 00010 00000 01540001001 86"