CHANGELOG: update for 5.5-rc0

Signed-off-by: William Roberts <william.c.roberts@intel.com>

Author: William Roberts

docs/CHANGELOG.md

@@ -4,6 +4,16 @@ All notable changes to this project will be documented in this file.
 
 Starting with release 5.4, The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
+## 5.5-rc0 - 2022-12-05
+
+### Added
+  * tpm2_createek:
+      - SM2 EK Support
+
+  * misc:
+    - SM2 support to internal OSSL format key routines. Fixes --format
+      flags for conversions.
+
 ## 5.4 - 2022-12-05
 
 ### Added: