made the example match the code in the user's guide

examples/minimal.go

@@ -13,11 +13,16 @@ func main() {
 	rand.Seed(time.Now().UTC().UnixNano())
 
 	e := enum.NewEnumeration()
+	if e == nil {
+        return
+	}
+
 	go func() {
 		for result := range e.Output {
 			fmt.Println(result.Name)
 		}
 	}()
+
 	// Setup the most basic amass configuration
 	e.Config.AddDomain("example.com")
 	e.Start()