update mailing list info

update mailing list info

librelist no longer offers rsync-able archives, and over the years
I've become less and less satisfied with subscription-required
mailing lists.

So the new mailing list will be a public-inbox[1] with no
subscription required at:

	ruby-tdb-public@bogomips.org

Since no subscription is required, please Cc: all recipients
(LKML-style) as many participants are NOT subscribed.

I've subscribed the current list address to the old librelist
address so old posts continue to go through.

[1] http://public-inbox.org/README