update README

Author: simonswiss

README.md

@@ -6,6 +6,6 @@ There is no authentication nor access restriction in there — it's just meant
 
 For things to work properly, you'll need to:
 
--   **Seed the data**: Run the Database seeder with `php artisan migrate:fresh --seed`. You should see 6 puppies in your database.
+-   **Seed the data**: Run the Database seeder with `php artisan migrate:fresh --seed`. You should see 9 puppies in your database.
 -   **Create a symbolic link from source directory**: Run `php artisan storage:link` to make stored images accessible publicly.
 -   **Run the Laravel app locally** and make sure the React app uses the correct API URL when trying to hit it.