fix serial speed

examples/main.go

@@ -20,7 +20,7 @@ func main() {
 	}
 
 	// Create a new derby clock connection
-	clock, err := derby.NewDerbyClock(portName, 9600)
+	clock, err := derby.NewDerbyClock(portName, 19200)
 	if err != nil {
 		fmt.Printf("Error opening derby clock: %v\n", err)
 		os.Exit(1)