CHANGELOG: update for 2.2.0-rc1

Signed-off-by: Erik Larsson <who+github@cnackers.org>

CHANGELOG.md

@@ -4,15 +4,18 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## 2.2.0-rc0 - 2023-08-26
+## 2.2.0-rc1 - 2023-08-26
 ### Fixed
 - Fix pycparse error for __float128.
 - Fix check on ESYS_TR in policy_secret.
+- Fix readthedocs builds.
+- Fix hardcoded sizes in the policy module.
 
 ### Added
 - Add routine for making ESYS_TR from parts.
 - Support unmarshal and marshal routines for constants.
 - Provide a better error message for missing symbols.
+- Add support for python 3.12.
 
 ### Removed
 - Drop support for python 3.7.