docs: def members(self, is_manager=None):
          """
          Retrieve members of the scope.
  
          :param is_manager: (optional) set to True to return only Scope members that are also managers.
          :type is_manager: bool
          :return: List of members (usernames)
  
          Examples
          --------
          >>> members = project.members()
          >>> managers = project.members(is_manager=True)
  
          """
          if not is_manager:
              return [member for member in self._json_data['members'] if member['is_active']]
          else:
              return [member for member in self._json_data['members'] if
                      member.get('is_active', False) and member.get('is_manager', False)]