docs(changelog) update changelog to kong 2.4.0 (#7001)
docs(changelog) update changelog to kong 2.4.0 (#7001)

Co-authored-by: Vinicius Mignot <16989b0990827e84dc3edf87410a8169e8edb2d6@gmail.com>
Co-authored-by: Terry L. Blessing <60d91453f7edefe23ced17d6cf78685c0511c88d@konghq.com>
Kong/kong,Kong/kong,Kong/kong