[ih] update about bogus list unsubcribe requests

[John Levine]

>> I picked [Sympa] both because I already run mysql and didn't want to
>> install postgresql which mailman needs, ...
>
>nope. i wish it were so.

When I looked at mailmam a year or so ago, it said they do all the
development with postgresql, but since it's SQL it should work with
other SQL databases such as mysql, but they haven't tried it.

Has that changed?  That seems close enough to "needs" for practical purposes.