Merge pull request #3 from Innmind/reference-migrations

Reference `formal/migrations` instead of Doctrine

docs/getting-started/orm/production.md

@@ -54,8 +54,8 @@ This code automatically execute the queries to create the tables. You could inst
 
 1. `#!php $_ = $show(User::class)->foreach(var_dump(...));`
 
-??? warning
-    Unfortunately Innmind doesn't have a migration package yet. For now you could use [`doctrine/migrations`](https://packagist.org/packages/doctrine/migrations).
+??? tip
+    You can use [`formal/migrations`](https://formal-php.github.io/migrations/) to run your migrations.
 
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