update laravel-wallet-uuid.md

Author: rez1dent3

docs/laravel-wallet-uuid.md

@@ -1,5 +1,13 @@
 ## Laravel Wallet UUID
 
+> Using uuid greatly reduces package performance. We recommend using int.
+
+Often there is a need to store an identifier in uuid/ulid. Since version 9.0 laravel-wallet supports string identifiers, you only need to perform the migration.
+
+To simplify the process, you can use a ready-made package.
+
+> Attention! It will not work to use UUID instead of ID in wallet models; there is a special uuid field for this.
+
 ## Composer
 
 The recommended installation method is using [Composer](https://getcomposer.org/).
@@ -13,6 +21,7 @@ composer req bavix/laravel-wallet-uuid
 Now you need to migrate!
 
 After migration, you can use the UUID in your models.
-Attention! It will not work to use UUID instead of ID in wallet models; there is a special uuid field for this.
+
+You can find implementation examples in the package tests: https://github.com/bavix/laravel-wallet-uuid/tree/master/tests
 
 It worked!