update license and attribution to original work

Author: aozisik

LICENSE.md

@@ -1,6 +1,7 @@
 # The MIT License (MIT)
 
-Copyright (c) Ahmet Özisik <hello@swiftmade.co>
+Copyright (c) 2022 Swiftmade OÜ <hello@swiftmade.co>
+Copyright (c) 2019 Cuong Giang
 
 > Permission is hereby granted, free of charge, to any person obtaining a copy
 > of this software and associated documentation files (the "Software"), to deal

README.md

@@ -120,7 +120,7 @@ Please see [CONTRIBUTING](CONTRIBUTING.md) for details.
 ## Credits
 
 -   [swiftmade](https://github.com/swiftmade)
--   [cuonggt](https://github.com/cuonggt/sendgrid)
+-   [cuonggt](https://github.com/cuonggt/laravel-sendgrid-notification-channel)
 -   [All Contributors](../../contributors)
 
 ## License