Add changelog entry for #3247 (Copy XMP/Exif ...)
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e845fb2..a0a8d88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
 ### Changed since 1.4.2
 
 * Update LocalAvm.cmake: v1.0.0
+* Copy XMP/Exif in avifgainmaputil tonemap
 
 ## [1.4.2] - 2026-05-26