Update readme

Author: markusjwetzel

README.md

@@ -10,7 +10,7 @@ It's the perfect choice, if you want to use the same templates in different lang
 
 Laravel Handlebars is distributed as a composer package. So you first have to add the package to your `composer.json` file:
 
-- For Laravel 6.x, 7.x, 8.x:
+- For Laravel 6.x, 7.x, 8.x, 9.x:
 
     ```json
     "proai/laravel-handlebars": "^1.11"