Update CHANGELOG.md

CHANGELOG.md

@@ -389,4 +389,5 @@ Instalation of the existing project with Django
         * Create a dict for the old values to check which field have changed
         * Forward the current user to the history
     * A new global model for the classical models and for the geographical models
-        * Will create a new history record
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+        * Will create a new history record
+    * Save in database (as JSON) the old an new value, when is it an object update
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