Update readme.md

Author: finity69x2

readme.md

@@ -2,6 +2,8 @@
 
 ## This is an element to add a fan control row to Home Assistant.
 
+## This plugin is only valid foir use with Home Assistant Version 2021.2.x and before. fo HA versions after that use fan-percent-button-row or fam-mode-button-row.
+
 It uses the code that can be found in my fan control package @ https://github.com/finity69x2/Home-Assistant/blob/master/packages/fan_package.yaml
 
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