[#3532] Add ChangeLog and AUTHORS entries.

Author: dimitry-unified-streaming

AUTHORS

@@ -265,3 +265,6 @@ We have received the following contributions:
 
  - Kevin P. Fleming
    2023-02: Fixed several examples in DHCPv6 section of the ARM.
+
+ - Dimitry Andric
+   2024-08: Added support for libc++ 19 and later.

ChangeLog

@@ -1,5 +1,12 @@
 Kea 2.7.2 (development) released on August 28, 2024
 
+2278.	[build]		dim
+	Replace ``std::basic_string<uint8_t>`` with equivalent
+	``std::vector<uint8_t>`` constructs, since the former has been
+	deprecated for a while in libc++, and has been completely
+	removed as of libc++ 19.
+	(Gitlab #3532)
+
 2277.	[build]		andrei
 	"libca_rbac.so" is now a symbolic link to "libdhcp_rbac.so".
 	(Gitlab #3550)