Client setEnterpriseUrl method is private

[jacobtruman]

The documentation for using the Enterprise API (https://github.com/KnpLabs/php-github-api/blob/master/doc/enterprise.md) says you can set the enterprise URL like this:

$client->setEnterpriseUrl('https://ghe.host');

This fails because the method is private:

https://github.com/KnpLabs/php-github-api/blob/master/lib/Github/Client.php#L331

[acrobat]

This is indeed an issue with the docs as the enterprise url should be passed to the client constructor

So if you can please open a PR to fix the specific docs. Thanks!

[acrobat]

Fixed in #649