[whatwg/xhr] what's this mean ? fetch will be repalce xmlhttprequest ? (#115)

> **Synchronous XMLHttpRequest** on the main thread is deprecated because of its detrimental effects to the end user's experience. 
> For more help, check https://xhr.spec.whatwg.org/.

```
var xhr = new XMLHttpRequest();
xhr.open("GET", "https://www.codecademy.com/", false);
xhr.send();

console.log(xhr.status);
console.log(xhr.statusText);
```
![synchronous xmlhttprequest](https://cloud.githubusercontent.com/assets/18028768/23076347/058e62b0-f57b-11e6-9ce5-e536084118d3.png)


https://github.com/whatwg/fetch


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