Try and fix the clear command for tests

Signed-off-by: Will Dixon <will@willd.io>

clearScreen.go

@@ -1,6 +1,7 @@
 package wmenu
 
 import (
+	"fmt"
 	"os"
 	"os/exec"
 	"runtime"
@@ -11,24 +12,15 @@ var clear map[string]func()
 func init() {
 	clear = make(map[string]func())
 	clear["linux"] = func() {
-		cmd := exec.Command("clear")
-		cmd.Stdout = os.Stdout
-		err := cmd.Run()
-		if err != nil {
-			panic(err)
-		}
+		fmt.Print("\033[2J\033[H")
 	}
 	clear["darwin"] = func() {
-		cmd := exec.Command("clear")
-		cmd.Stdout = os.Stdout
-		err := cmd.Run()
-		if err != nil {
-			panic(err)
-		}
+		fmt.Print("\033[2J\033[H")
 	}
 	clear["windows"] = func() {
 		cmd := exec.Command("cmd", "/c", "cls")
 		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
 		err := cmd.Run()
 		if err != nil {
 			panic(err)

example/main.go

@@ -1,4 +1,4 @@
-//package main is to show how multiple menus can be used with eachother
+// package main is to show how multiple menus can be used with each other
 package main
 
 import (
@@ -36,7 +36,7 @@ func mainMenu() *wmenu.Menu {
 	menu := wmenu.NewMenu("What is your favorite food?")
 	menu.Option(menuItemStrings[pizza], pizza, true, nil)
 	menu.Option(menuItemStrings[iceCream], iceCream, false, nil)
-	menu.Option(menuItemStrings[tacos], tacos, false, func(opt wmenu.Opt) error {
+	menu.Option(menuItemStrings[tacos], tacos, false, func(_ wmenu.Opt) error {
 		fmt.Printf("Tacos are great!\n")
 		return nil
 	})
@@ -53,6 +53,7 @@ func mainMenu() *wmenu.Menu {
 
 func toppingsMenu(favorite menuItem) *wmenu.Menu {
 	menu := wmenu.NewMenu(fmt.Sprintf("What is your favorite topping for %s?", menuItemStrings[favorite]))
+	menu.ClearOnMenuRun()
 	if favorite == pizza {
 		menu.Option("Meat", nil, true, nil)
 		menu.Option("Cheese", nil, false, nil)