fix: root middleware not work

xtest/midd/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"github.com/loveuer/nf"
+	"log"
+)
+
+func main() {
+	app := nf.New()
+
+	app.Use(ml())
+	app.Get("/hello", func(c *nf.Ctx) error {
+		return c.SendString("world")
+	})
+
+	log.Fatal(app.Run(":7777"))
+}
+
+func ml() nf.HandlerFunc {
+	return func(c *nf.Ctx) error {
+		log.Printf("[ML] [%s] - [%s]", c.Method, c.Path())
+		return c.Next()
+	}
+}