Kosovo is missing

[jolora]

I'm working with a dataset that includes records for Kosovo but that is not available in this packages dataset.

Serbia shows Kosovo as a bordering country:

laravel-countries/src/Database/Seeders/Countries/RS_Serbia.php

Line 157 in 85b6bca

['name' => 'Kosovo', 'iso_alpha_2' => 'XK'],

So this doesn't seem to be an intentional decision to not include Kosovo.

I'm not knowledgeable enough about the country to provide a pull request myself though... sorry.