Update README.md

If took me a while to figure out how to enable the translation behavior, the needed Translatable on the main entity wasn't too clear. I updated the documentation to better explain the steps needed.
KnpLabs · Jun 29, 2014 · 252ba7d · 252ba7d
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@@ -185,8 +185,11 @@ class CategoryTranslation
 }
 
 ```
+The corresponding Category entity needs to `use ORMBehaviors\Translatable\Translatable;`.
 
-Now you can work on translations using `translate` or `getTranslations` methods.
+NB If you generate the entity with `./console doctrine:generate:entity`, you have to remove the private $id and the `setId` and `getId` functions.
+
+After updating the database, ie. with `./console doctrine:schema:update --force`, you can now work on translations using `translate` or `getTranslations` methods.
 
 ``` php