update release note

Release.md

@@ -1,3 +1,12 @@
+### New
+
+* Added `connect_server_local_ip` in frpc to specify local IP connected to frps.
+* Added `tcp_mux_keepalive_interval` both in frpc and frps to set `tcp_mux` keepalive interval seconds if `tcp_mux` is enabled. After using this params, you can set `heartbeat_interval` to `-1` to disable application layer heartbeat to reduce traffic usage(Make sure frps is in the latest version).
+
 ### Improve
 
+* Server Plugin: Added `client_address` in Login Operation.
+
+### Fix
+
 * Remove authentication for healthz api.