Add some changelog entries for recently-closed issues

CHANGELOG

@@ -1,5 +1,25 @@
 #Nmap Changelog ($Id$); -*-text-*-
 
+o [Nsock][GH#2595] Fixed Nsock's SOCKS4 proxy code on Windows, which was
+  sending an extra 3 null bytes at the beginning of connections.
+
+o [Ncat][GH#3005] Correctly report listening port number. `ncat -l -p 0` will
+  cause Ncat to listen on an ephemeral port, but it was reporting itself as
+  listening on port 0.
+
+o [Ncat][GH#1672] Fixed an issue where Ncat in server mode would quit without
+  printing the last received data on a connection, particularly affecting SCTP.
+
+o [Ncat][GH#2827] Fixed an issue where Ncat in --send-only mode would ignore
+  disconnects and crash when it tries to send data to a disconnected client.
+
+o [Ncat][GH#3291] Fixed an issue where Ncat on Windows would quit after 2
+  minutes due to an OS-enforced timeout on the half-open TCP socket used to
+  emulate STDIN.
+
+o [Nping][GH#564] Allow Nping to fall back to TCP Connect mode on Windows when
+  Npcap is not installed.
+
 o [Ncat] Fixed several issues reported by Muhammed Hussein involving crashes in
   Ncat's server-mode HTTP proxy, as well as one code-quality issue with its
   Telnet negotiation code.