don't fire ErrServerClosed on manually interrupt signals (CTRL/CMD+C)

Former-commit-id: 673c84dd13bb99c0926aa1b4a6b4eff9745403d8

_examples/tutorial/api-for-apache-kafka/src/main.go

@@ -77,7 +77,7 @@ func main() {
 	// POST, GET: http://localhost:8080/api/v1/topics
 	// POST     : http://localhost:8080/apiv1/topics/{topic}/produce?key=my-key
 	// GET      : http://localhost:8080/apiv1/topics/{topic}/consume?partition=0&offset=0 (these url query parameters are optional)
-	app.Listen(":8080", iris.WithoutServerError(iris.ErrServerClosed))
+	app.Listen(":8080")
 }
 
 // simple use-case, you can use templates and views obviously, see the "_examples/views" examples.