add example for both Geo IP and Duo

examples.go

@@ -11,7 +11,7 @@ func getExamples() [][]string {
 	examples = append(examples, []string{`allow only if remote IP is located within 75 miles of Atlanta, GA`, `gofwd -f 1.2.3.4:22 -t 192.168.192.1.1:22 -l 33.756529,-84.400996 -d 75`})
 	examples = append(examples, []string{`    to get Latitude, Longitude use https://www.latlong.net/`, ` `})
 	examples = append(examples, []string{`allow only for a successful two-factor duo auth for 'testuser'`, `gofwd -f 1.2.3.4:22 -t 192.168.192.1.1:22 --duo duo.ini:testuser`})
+	examples = append(examples, []string{`allow only after both Geo IP and Duo are verified`, `gofwd -f 1.2.3.4:22 -t 192.168.192.1.1:22 --region Texas --duo duo.ini:testuser`})
 
 	return examples
-
 }