Update CHANGELOG.md

Author: manisha-tanwar

CHANGELOG.md

@@ -8,6 +8,7 @@
 * Change st2packs definition to a list, to support multiple st2packs containers (#166) (by @moonrail)
 * Enabled RBAC/LDAP configuration for OSS version, removed enterprise flags (#182) (by @hnanchahal)
 * Fixed datastore_crypto_key secret name for rules engine (#188) (by @lordpengwin)
+* Updated redis constant sentinel ID which will allow other sentinel peers to update to the new given IP in case of pod failure or worker node reboots. (#191) (by @manisha-tanwar)
 
 ## v0.52.0
 * Improve resource allocation and scheduling by adding resources requests cpu/memory values for st2 Pods (#179)