MB-8569: added note about this ticket to CHANGES

Change-Id: I1b707b64bba8de66c4f7078923383e2379fb4433
Reviewed-on: http://review.couchbase.org/27555
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>