** libgnutls: Added new callback gnutls_keylog_func that enables a custom
logging functionality.
+** libgnutls: Added support for non-null terminated usernames in PSK
+ negotiation (#586).
+
** API and ABI modifications:
gnutls_hkdf_extract: Added
gnutls_hkdf_expand: Added
gnutls_pbkdf2: Added
gnutls_session_set_keylog_function: Added
gnutls_prf_hash_get: Added
+gnutls_psk_server_get_username2: Added
+gnutls_psk_set_client_credentials2: Added
+gnutls_psk_set_client_credentials_function2: Added
+gnutls_psk_set_server_credentials_function2: Added
* Version 3.6.12 (released 2020-02-01)