Rewrite middleware does not work on latest commit

[rvdwijngaard]

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Issue Description

Checklist

• Dependencies installed
• No typos
• Searched existing issues and docs

Expected behaviour

rewrite middleware should rewrite the url as configured

Actual behaviour

it returns a 404

Steps to reproduce

• get the latest version of echo (at least commit 7f44549)

Working code to debug

package main

import (
	"github.com/labstack/echo"
	"github.com/labstack/echo/middleware"
)

func main() {
	e := echo.New()
	e.Pre(middleware.RewriteWithConfig(middleware.RewriteConfig{
		Rules: map[string]string{
			"/old":              "/new",
			"/api/*":            "/$1",
			"/js/*":             "/public/javascripts/$1",
			"/users/*/orders/*": "/user/$1/order/$2",
		},
	}))
	e.GET("/users", func(c echo.Context) error {
		return c.String(200, "Yeah")
	})
	e.Logger.Fatal(e.Start(":8080"))
}

and than a curl :

curl localhost:8080/api/users

this returns a 404

When running this program with commit f4dde46 it works as expected.

Version/commit

7f44549