Adding 1.15.3 Release to CHANGELOG

(cherry picked from commit c6bee616)

CHANGELOG.md

@@ -7,6 +7,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 * [!1.16.0](https://repo1.dso.mil/platform-one/big-bang/bigbang/-/merge_requests?scope=all&utf8=%E2%9C%93&state=merged&milestone_title=1.16.0); List of merge requests in this release.
 
+## [1.15.3]
+
+* [!887](https://repo1.dso.mil/platform-one/big-bang/bigbang/-/merge_requests/887): Twistlock Network Policy & BigBang/Package value `networkPolicies.nodeCidr` for defender to console communication
+* [!852](https://repo1.dso.mil/platform-one/big-bang/bigbang/-/merge_requests/852): Adding violation exceptions to stop Gatekeeper blocking twistlock console deployment
+* [!890](https://repo1.dso.mil/platform-one/big-bang/bigbang/-/merge_requests/890): Adding violation exception for twistlock-defenders to use selinux `spc_t` settings
+
 ## [1.15.2]
 
 * [!846](https://repo1.dso.mil/platform-one/big-bang/bigbang/-/merge_requests/846): Istio-cni hub correction to point to valid repo in registry1 & Add install-cni image to synker.yaml for air-gapped environments