Add 1.5.0 release notes

RELEASE_NOTES.md

@@ -1,5 +1,15 @@
 # Release Notes
 
+## stable-1.15-1.5.0, stable-1.16-1.5.0
+
+* \[Elasticsearch\] revert the PVC size to default (30G) for data nodes ([#203](https://github.com/mesosphere/kubernetes-base-addons/pull/203), [@jieyu](https://github.com/jieyu))
+* \[Prometheus\] Upgrade prometheus-operator chart to v8.8.4 ([#205](https://github.com/mesosphere/kubernetes-base-addons/pull/205), [@joejulian](https://github.com/joejulian))
+* \[awsebscsiprovisioner\] Upgrade awsebscsiprovisioner chart to 0.3.5 and aws-ebs-csi-driver to 0.5.0. ([#186](https://github.com/mesosphere/kubernetes-base-addons/pull/186), [@sebbrandt87](https://github.com/sebbrandt87))
+* \[kube-oidc-proxy\] allow using default system CA bundle. ([#191](https://github.com/mesosphere/kubernetes-base-addons/pull/191), [@jieyu](https://github.com/jieyu))
+* \[Traefik\] Upgrade Traefik to 1.7.23. This change fixes the ability to access the Kubernetes API server when the connection needs to be upgraded to SPDY, among other bug fixes. For more details, see https://github.com/mesosphere/charts/pull/514. ([#190](https://github.com/mesosphere/kubernetes-base-addons/pull/190), [@joejulian](https://github.com/joejulian))
+* \[dex-k8s-authenticator\] allow to use system default CA ([#189](https://github.com/mesosphere/kubernetes-base-addons/pull/189), [@jieyu](https://github.com/jieyu))
+* \[Istio\] Disable Istio PodDisruptionBudget, the default settings and replica count of 1 prevents pods on nodes from being drained. ([#183](https://github.com/mesosphere/kubernetes-base-addons/pull/183), [@dkoshkin](https://github.com/dkoshkin))
+
 ## stable-1.15-1.4.1, stable-1.16-1.4.1
 
 * \[Velero\] revert the velero refactor in stable-1.16-1.4.0 due to a data loss issue ([#197](https://github.com/mesosphere/kubernetes-base-addons/pull/197), [@jieyu](https://github.com/jieyu))