Specify minimum Java version requirement

Added Java version requirement to README.

Author: kwin

README.md

@@ -102,6 +102,8 @@ You can use this validator with the [FileVault Package Maven Plugin][filevault-p
 </plugin>
 ```
 
+It requires at least Java 17 to run.
+
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 [aemanalyser-maven-plugin-issue]: https://github.com/adobe/aemanalyser-maven-plugin/issues/418