Update CHANGELOG

CHANGELOG

@@ -1,15 +1,18 @@
 # CHANGELOG
 
 - 20210311      Add local volume control for UDP connections.
+
                 add volume control to audiohandler
+
                 Small fixes to UDP server
+
                 Add USB audio handling to UDP server
+
                 Changed frequency parameters to (mostly) unsigned 64-bit ints. This
                 makes all the rounding code very simple and removes many annoying lines
                 of code designed to handle errors induced by using doubles for the
                 frequency.
 
-
 - 20210310	audio resampling added / opus
 		updates on virtual serial port 
 		fixed input combo boxes from growing