Update CHANGES.rst [ci skip]

radarhere · radarhere · commit f6683683c8b0 · 2021-07-01T00:30:00.000+10:00
diff --git a/CHANGES.rst b/CHANGES.rst
@@ -5,6 +5,9 @@ Changelog (Pillow)
 8.3.0 (unreleased)
 ------------------
 
+- Allow ICNS save on all operating systems #4526
+  [baletu, radarhere, newpanjing, hugovk]
+
 - De-zigzag JPEG's DQT when loading; deprecate convert_dict_qtables #4989
   [gofr, radarhere]
 
