Update README.md

Altinity · Dec 5, 2024 · 7c31650 · 7c31650
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@@ -28,6 +28,7 @@ Altinity Kubernetes Operator for ClickHouse creates, configures and manages Clic
 ## Requirements
 
  * Kubernetes 1.19+
+ * ClickHouse 21.11. For older ClickHouse versions use operator 0.23.7 or earlier.
 
 ## Documentation