France IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "FR",
    ...>    check_digits: "14",
    ...>    bank_code: "20041",
    ...>    branch_code: "01005",
    ...>    national_check: "06",
    ...>    account_number: "0500013M026"
    ...>  }
    ...>  |> IbanEx.Country.FR.to_string()
    "FR 14 20041 01005 0500013M026 06"