chore: Compatibility Notice (#110)

Signed-off-by: Yellow Shine <sammy.huang@zilliz.com>

charts/milvus/README.md

@@ -12,6 +12,9 @@ This chart bootstraps Milvus deployment on a Kubernetes cluster using the Helm p
 - Kubernetes 1.14+ (Attu requires 1.18+)
 - Helm >= 3.2.0
 
+## Compatibility Notice
+As of version 4.2.0, the Milvus Helm chart no longer supports Milvus v2.3.x. If you need to deploy Milvus v2.3.x using Helm, please use Milvus Helm chart version less than 4.2.0 (e.g 4.1.36).
+
 > **IMPORTANT** The master branch is for the development of Milvus v2.x. On March 9th, 2021, we released Milvus v1.0, the first stable version of Milvus with long-term support. To use Milvus v1.x, switch to [branch 1.1](https://github.com/zilliztech/milvus-helm/tree/1.1).
 
 ## Install the Chart