Update changelog

(cherry picked from commit 59bb8309)

CHANGELOG.rst

@@ -6,6 +6,13 @@ All notable changes to this project will be documented in this file.
 The format is based on `Keep a Changelog`_,
 and this project adheres to `Semantic Versioning`_.
 
+Unreleased
+----------
+
+Fixed
+~~~~~
+
+* Use correct HTML 5 elements for the search frontend and fix CSS according.
 
 `2.0rc2`_ - 2021-06-24
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