Updating CHANGELOG

Author: gershnik

CHANGELOG.md

@@ -5,6 +5,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## Unreleased
 
+### Added
+- `addressOfBoxedValue` in BoxUtil that allows to check whether the passed object
+  contains a given boxed type and returns pointer to it (or null if not).
+
+### Fixed
+- `copy(makeBlock(...))` now works again with newer Xcode/clang
+
 ## [3.7.0] - 2026-06-20
 
 ### Added