Update CHANGELOG.md

CHANGELOG.md

@@ -87,6 +87,13 @@ fn process_response(response) {
 
 By [@lrlna](https://github.com/lrlna) in https://github.com/apollographql/router/pull/4632
 
+### Helm update to allow a list of gateways to `VirtualService` ([Issue #4464](https://github.com/apollographql/router/issues/4464))
+
+Configuration of the router's Helm chart has been updated to allow multiple gateways. This enables configuration of multiple gateways in an Istio `VirtualService`.
+
+The previous configuration for a single `virtualservice.gatewayName` has been deprecated in favor of a configuration for an array of `virtualservice.gatewayNames`.
+
+By [@marcantoine-bibeau](https://github.com/marcantoine-bibeau) in https://github.com/apollographql/router/pull/4520
 
 ### Configure logging format automatically based on terminal ([Issue #4369](https://github.com/apollographql/router/issues/4369))