Update couchdb revision

Change-Id: Ibb500ccc99e14e0da4dc07396f085dd87b6007e4
Reviewed-on: http://review.couchbase.org/23906
Reviewed-by: Filipe David Borba Manana <fdmanana@gmail.com>
Tested-by: Filipe David Borba Manana <fdmanana@gmail.com>