examples: replace all app.Run(iris.Addr(...)) with app.Listen just for the shake of simplicity, both are doing the same exact thing as it's described on the http listening first example.

Former-commit-id: d20afb2e899aee658a8e0ed1693357798df93462

_examples/authentication/basicauth/main.go

@@ -45,7 +45,7 @@ func newApp() *iris.Application {
 func main() {
 	app := newApp()
 	// open http://localhost:8080/admin
-	app.Run(iris.Addr(":8080"))
+	app.Listen(":8080")
 }
 
 func h(ctx iris.Context) {