mklive.sh.in: detect xbps>=0.20 correctly.

mklive.sh.in

@@ -394,7 +394,7 @@ fi
 XBPS_VERSION=$($XBPS_QUERY_CMD -V|awk '{print $2}')
 case $XBPS_VERSION in
 # XBPS >= 0.18
-    [0-9].[1-9][8-9]*) ;;
+    [0-9].[1-9][8-9]*|[0-9].[2-9][0-9]*) ;;
 *) echo "Your xbps utilities are too old ($XBPS_VERSION), 0.18 is required." && exit 1;;
 esac