doc: add publish migration in installation

Author: cesargb

README.md

@@ -36,15 +36,19 @@ You can install this package via composer using:
 composer require cesargb/laravel-magiclink
 ```
 
-You can then create the table by running the
-migrations:
+### Preparing the database
+
+You need to publish the migration to create the `magic_links` table:
 
 ```bash
-php artisan migrate
+php artisan vendor:publish --provider="MagicLink\MagicLinkServiceProvider" --tag="migrations"
 ```
 
-Note: If you have the version 1 installed,
-[read this](https://github.com/cesargb/laravel-magiclink/blob/v1/README.md).
+After that, you need to run migrations.
+
+```bash
+php artisan migrate
+```
 
 ## Use case