Update README.md

Update README to include note that Cassandra 4.0 is unsupported.
instaclustr · Jul 22, 2022 · e6da3f1 · e6da3f1
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 *Project Status: beta*
 
+# Note - The Cassandra-Exporter tool does not support Cassandra 4.0 or newer, see the compatibility section for more details on supported versions.
+
 
 ## Introduction