FK to version always points to a version table

def deconstruct(self):
        """
        FK to version always points to a version table
        """
        name, path, args, kwargs = super(FKToVersion, self).deconstruct()
        if not kwargs['to'].endswith('_version'):
            kwargs['to'] = '{0}_version'.format(kwargs['to'])
        return name, path, args, kwargs