Typo

I think there is a typo on [this](https://github.com/dcodeIO/node.js-closure-compiler-externs/blob/master/dns.js#L144) line.

``` javascript
dns.BADNAME = 'EADNAME';
```

Judging from the rest of the file's contents it looks like it should be.

``` javascript
dns.BADNAME = 'EBADNAME';
```
