Add changelog

Author: linev

changes.md

@@ -4,7 +4,8 @@
 1. Fix - prevent glitch when enabling projection via context menu
 2. Fix - multi.json parsing
 3. Fix - decoding of multipart message (#250)
-4. Backport - let specify `settings.PreferSavedPoints` to force usage of saved TF1 points
+4. Fix - use alpha channel for `TColor` when intended
+5. Backport - let specify `settings.PreferSavedPoints` to force usage of saved TF1 points
 
 
 ## Changes in 7.2.0