Update changelog

(cherry picked from commit fc2aa31c)

CHANGELOG.rst

@@ -6,6 +6,14 @@ 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
+~~~~~
+
+* Configuration mechanisms for OpenID Connect were broken.
+
 `2.0rc6`_ - 2021-10-11
 ----------------------