Replace deprecated `props.url` in readme (#4952)
Replace deprecated `props.url` in readme (#4952)

Following https://github.com/zeit/next.js/pull/4950

Fix https://github.com/zeit/next.js/issues/4716

I'm not sure to understand this part, though :
> Note: in order to programmatically change the route without triggering navigation and component-fetching, use `props.url.push` and `props.url.replace` within a component

Is there a difference between :
```jsx
export default () => <a onClick={() => Router.push('/about')}>About</a>
```

and
 
```jsx
export default withRouter(
  () => <a onClick={() => props.router.push('/about')}>About</a>
)
```
?
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