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#utf8 detector

Detect if a Buffer is utf8 encoded. 
It need The minimum amount of bytes is 4.


```javascript
    var fs = require('fs');
    var isUtf8 = require('is-utf8');
    var ansi = fs.readFileSync('ansi.txt');
    var utf8 = fs.readFileSync('utf8.txt');
    
    console.log('ansi.txt is utf8: '+isUtf8(ansi)); //false
    console.log('utf8.txt is utf8: '+isUtf8(utf8)); //true
```