rewrite url when no params fails to pass query strings

works
```js
var rewrites = {'/postsWithAuthor/:id': '/posts/:id?_embed=authors'}
app.use(jsonServer.rewriter(rewrites))
````
not working because it doesn't update req.query object, it only update the url
```js
var rewrites = {'/postsWithAuthor/': '/posts?_embed=authors'}
app.use(jsonServer.rewriter(rewrites))
```

I'll do a quick PR for to fix this.