update supported OS versions

Author: jamescassell

defaults/main.yml

@@ -291,8 +291,8 @@ rhel7stig_gui: no
 # These are the minimum supported releases.
 # (Red Hat has support for older versions if you pay extra for it.)
 rhel7stig_min_supported_os_ver:
-    RedHat: "7.5"
-    CentOS: "7.4.1708"
+    RedHat: "7.6"
+    CentOS: "7.6.1810"
 
 # RHEL-07-040740
 # If system is not router, run tasks that disable router functions.