[1.8.x] Replaced deprecated requires_model_validation in docs.

.. method:: BaseCommand.get_version()

    Return the Django version, which should be correct for all

    built-in Django commands. User-supplied commands can

    override this method to return their own version.

    Returns the Django version, which should be correct for all built-in Django

    commands. User-supplied commands can override this method to return their

    own version.

.. method:: BaseCommand.execute(*args, **options)

    Try to execute this command, performing model validation if

    needed (as controlled by the attribute

    :attr:`requires_model_validation`). If the command raises a

    :class:`CommandError`, intercept it and print it sensibly to

    stderr.

    Tries to execute this command, performing system checks if needed (as

    controlled by the :attr:`requires_system_checks` attribute). If the command

    raises a :class:`CommandError`, it's intercepted and printed to stderr.

.. admonition:: Calling a management command in your code