Update README.md

Author: alex-zaitsev

README.md

@@ -28,7 +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.
+ * ClickHouse 21.11+. For older ClickHouse versions use operator 0.23.7 or earlier.
 
 ## Documentation