update changelog

Author: thomashebrard

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - Added an API serializer: introducing the `compact_memory`, a new way to store the working memeory for the API.
 - Added `StorageProviderAbstract`
+- Improved creating concept from attributes (without useless dict creation). When the Concept has no given structure and no explicit `refines`, set it to refine `native.Text`
 
 ## [v0.4.6] - 2025-06-24