rtic-sync: Update CHANGELOG

Author: datdenkikniet

rtic-sync/CHANGELOG.md

@@ -7,8 +7,12 @@ For each category, _Added_, _Changed_, _Fixed_ add new entries at the top!
 
 ## [Unreleased]
 
+### Changed
+
 - Don't force `Signal` import when using `make_signal` macro
-- Update `make_signal`'s documentation to match `make_channel`'s 
+- Update `make_signal`'s documentation to match `make_channel`'s
+- Actually drop items left over in `Channel` on drop of `Channel`.
+- Allow for `split()`-ing a channel more than once without immediately panicking.
 
 ## v1.3.2 - 2025-03-16