ing-diba: wrong bookingDate year

[andrenam]

with INGDiba
this MT940 raw data gets parsed as

:20:0
:21:NONREF
:25:50010517/5414367241
:28C:0
:60F:C171126EUR313,52
:34F:EURD10,99
:13D:1711272221-0000
:61:1711271201D10,99NMSCNONREF
:86:005?00Lastschrifteinzug?10009599?20SVWZ+NETFLIX.COM 866.579.71?21
72Datum 27.11.2017 Zeit 04.?2246Kaufumsatz VISA CardEUR 1?230,99?
32NETFLIX.COM              86?336-579-7172                 
-

Fhp\Model\StatementOfAccount\Transaction Object
(
    [bookingDate:protected] => DateTime Object
        (
            [date] => 2016-12-01 00:00:00.000000
            [timezone_type] => 3
            [timezone] => UTC
        )

    [valutaDate:protected] => DateTime Object
        (
            [date] => 2017-11-27 00:00:00.000000
            [timezone_type] => 3
            [timezone] => UTC
        )

    [amount:protected] => 10.99
    [creditDebit:protected] => debit
    [bookingText:protected] => Lastschrifteinzug
    [description1:protected] => SVWZ+NETFLIX.COM 866.579.7172Datum 27.11.2017 Zeit 04.46Kaufumsatz VISA CardEUR 10,99
    [description2:protected] => 
    [bankCode:protected] => 
    [accountNumber:protected] => 
    [name:protected] => 6-579-7172
)

with valuta date: 2017-11-27
and booking date: 2016-12-01

when instead the real booking date seems to be: 2017-12-01

Line 126 in MT940.php seems to be responsible:
https://github.com/mschindler83/fints-hbci-php/blob/master/lib/Fhp/Parser/MT940.php#L126

substr($transaction, 2, 2) and substr($transaction, 6, 2) evaluate to 11 and 12,
so $year gets decremented.