Update README.rst (#424)

* Update README.rst

* Update README.rst

---------

Co-authored-by: Vinit Kumar <[email protected]>

Author: fsbraun

README.rst

@@ -32,9 +32,11 @@ Add ``djangocms_versioning`` to your project's ``INSTALLED_APPS``.
 
 Run::
 
-    python manage.py migrate djangocms_versioning
+    python -m manage migrate djangocms_versioning
+    python -m manage create_versions --user-id <user-id-of-migration-user> 
 
-to perform the application's database migrations.
+to perform the application's database migrations and (only if you have an existing database) add version objects
+needed to mark existing versions as draft.
 
 
 =====