Drop refer to obsolete versions

README.md

@@ -17,11 +17,8 @@ policies, ports, and rich rules.
 
 ## Compatibility
 
-Latest versions of this module (3.0+) are only supported on Puppet
-4.0+. 2.2.0 is the latest version to run on Puppet 3.x, important
-patches (security bugs..etc) will be accepted in the 2.x until Puppet
-3.x is offically end-of-life, but new features will only be accepted
-in 3.x.
+Latest versions of this module are only supported on Puppet
+7.0+.
 
 ## Usage