actualize ChangeLog.md

Signed-off-by: Slach <bloodjazman@gmail.com>

Author: Slach

ChangeLog.md

@@ -1,6 +1,7 @@
 # v2.6.35
 BUG FIXES
 - fix corner case for restoring REFRESHABLE MATERIALIZED VIEWs, fix [1232](https://github.com/Altinity/clickhouse-backup/issues/1232)
+- fix errors during restore RBAC objects stored in old format, affected 2.6.34 fix [1238](https://github.com/Altinity/clickhouse-backup/issues/1238)
 
 # v2.6.34
 IMPROVEMENTS