Update mysqltuner.pl

Author: ShaiMagal

mysqltuner.pl

@@ -2554,7 +2554,8 @@ sub validate_mysql_version {
         or mysql_version_eq( 10, 6 )
         or mysql_version_eq( 10, 11 )
         or mysql_version_eq( 11, 4 )
-        or mysql_version_eq( 11, 6 ) )
+        or mysql_version_eq( 11, 6 )
+        or mysql_version_eq( 11, 8 ) )
     {
         goodprint "Currently running supported MySQL version "
           . $myvar{'version'} . "";