Mauritius IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "MU",
    ...>    check_digits: "17",
    ...>    bank_code: "BOMM01",
    ...>    branch_code: "01",
    ...>    account_number: "101030300200000MUR"
    ...>  }
    ...>  |> IbanEx.Country.MU.to_string()
    "MU 17 BOMM01 01 101030300200000MUR"