Add snap() method to return 1 item with Extract from Array

[roberto-butti]

In Draw class, extract method returns a sub array.
In order to retrieve just 1 value from original array add snap() method.
In order to retrieve just 1 key from original array add snapKey() method.

Example usage:

use HiFolks\RandoPhp\Draw;

$randomLanguage = Draw::sample(["PHP", "Python", "Golang", "Javascript"])->snap();
var_dump($randomLanguage);