docs: def load_envars(self, items):
      '''load a tuple of environment variables, to add to the user settings
      
          Example:
   
          items = [('HELPME_DISCOURSE_BOARD', 'user_prompt_board'),
                   ('HELPME_DISCOURSE_CATEGORY', 'user_prompt_category')]
  
          # Note that it's added to the client with an underscore:
          self._load_envars()
      ''' 
      for item in items:
          envar = item[0]
          key = item[1]
          value = self._get_and_update_setting(envar)
  
          if value != None:
              self.data[key] = value
              self.config.remove_option(self.name, key)