The split of ssl_handle_hs_message_post_handshake() into
ssl_tls12_handle_hs_message_post_handshake() and
ssl_tls13_handle_hs_message_post_handshake() fixed some user-visible bugs.
Add a changelog entry for those bugs.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
