update changelog

Author: ThibautBorn

CHANGES.rst

@@ -9,6 +9,8 @@ Changelog
   [mamico]
 - Fixed data extraction of Archetypes ATFilefields to concatenate all `Pdata` chunks, when the FileField data was still stored in Filestorage and not not migrated to use blobstorage (using plone.app.blobs).
   [@jnptk]
+- Add option to export portal settings (local roles, default pages, portlets)
+  [ThibautBorn]
 
 1.15 (2025-07-15)
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