docs: def update_stack(name, template_body=None, template_url=None, parameters=None, notification_arns=None,
                   disable_rollback=False, timeout_in_minutes=None, capabilities=None, tags=None,
                   use_previous_template=None, stack_policy_during_update_body=None, stack_policy_during_update_url=None,
                   stack_policy_body=None, stack_policy_url=None, region=None, key=None, keyid=None, profile=None):
      '''
      Update a CFN stack.
  
      .. versionadded:: 2015.8.0
  
      CLI Example:
  
      .. code-block:: bash
  
          salt myminion boto_cfn.update_stack mystack template_url='https://s3.amazonaws.com/bucket/template.cft' \
          region=us-east-1
      '''
      conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
  
      try:
          update = conn.update_stack(name, template_body, template_url, parameters, notification_arns,
                                     disable_rollback, timeout_in_minutes, capabilities, tags, use_previous_template,
                                     stack_policy_during_update_body, stack_policy_during_update_url,
                                     stack_policy_body, stack_policy_url)
          log.debug('Updated result is : %s.', update)
          return update
      except BotoServerError as e:
          msg = 'Failed to update stack {0}.'.format(name)
          log.debug(e)
          log.error(msg)
          return six.text_type(e)