5.6.0

• New: when using step reference/dump, it is possible to use a custom label instead of the reference name

• New: when creating array references, it is possible to allow them to be empty without this being considered an error.
  Ex:

            ...
            references_type: array
            references_allow_empty: true
            references:
                -   identifier: my_content_ids
                    attribute: content_id
  

• New: the classes which implement MigrationGeneratorInterface will now receive the whole step definition as part of the $context parameter for the generateMigration call. This allows them to tailor the generated migration definition based on custom conditions.