update changelog for rc (#2495)

Author: mattdurham

CHANGELOG.md

@@ -7,6 +7,11 @@ This document contains a historical list of changes between releases. Only
 changes that impact end-user behavior are listed; changes to documentation or
 internal API changes are not present.
 
+v1.6.1-rc.0
+-----------------
+
+- Resolve issue with Beyla starting. (@rafaelroquetto)
+
 v1.6.0
 -----------------