Support for Laravel 8?

[ap-coder]

Please update the support to the new laravel version.

[sebastienheyd]

See #35

[ap-coder]

Thanks, i updated but there are still some issues. when i run php artisan vendor:publish --provider="Thomaswelton\LaravelGravatar\LaravelGravatarServiceProvider" to publish the config file it does not work. also when i manually add it the site errors out saying there is not default set. So i assume it also does not read the config file.

InvalidArgumentException
The default image specified is not a recognized gravatar "default" and is not a valid URL