update changelog

Author: Archmonger

docs/source/developing-idom/changelog.rst

@@ -6,6 +6,19 @@ The IDOM team manages their short and long term plans with `GitHub Projects
 team are working on, or have feedback on how issues should be prioritized, feel free to
 :discussion-type:`open up a discussion <question>`.
 
+0.35.5
+------
+
+Fixed an exception that may occur on a child component's state change.
+
+**Closed Issues**
+
+- v0.35.4 regression: State mismatch during component update  - :issue:`629`
+
+**Pull Requests**
+
+- Fix state mismatch during component update - :pull:`631`
+
 
 0.35.4
 ------