Update README.md

JanSlabon · JanSlabon · commit e830416b3ac5 · 2018-12-05T14:55:56.000+01:00
diff --git a/README.md b/README.md
@@ -198,3 +198,7 @@ return [
     'privateKey' => '/path/to/your/private/key.pem'
 ];
 ```
+
+## License
+
+This package is open-sourced software licensed under the [MIT license](https://opensource.org/licenses/MIT).
