add changelog entry

Author: rmorshea

docs/source/about/changelog.rst

@@ -23,7 +23,10 @@ more info, see the :ref:`Contributor Guide <Creating a Changelog Entry>`.
 Unreleased
 ----------
 
-No changes.
+**Fixed**
+
+- :issue:`930` - better traceback for JSON serialization errors (via :pull:`1008`)
+- :issue:`437` - explain that JS component attributes must be JSON (via :pull:`1008`)
 
 
 v1.0.0