Add License URL

Using this module and getting Warning: Undefined array key "url" in Drupal\Core\Asset\CssCollectionOptimizerLazy->optimizeGroup() (line 160 of core/lib/Drupal/Core/Asset/CssCollectionOptimizerLazy.php).

see https://www.drupal.org/project/drupal/issues/3359497 🐛 Log an error message when library definitions have a license with no URL defined Needs work the module should have a URL set for the license. Patch attached