Update README.md

Author: JulianPrieber

README.md

@@ -299,3 +299,4 @@ You can support LittleLink Custom [here](https://littlelink-custom.com/sponsor).
 - [general animations](https://github.com/animate-css/animate.css)
 - [config editor](https://github.com/GeoSot/Laravel-EnvEditor)
 - [text editor](https://github.com/ckeditor/ckeditor4)
+- [updater backend](https://github.com/codedge/laravel-selfupdater)