docs: def send_message(slack):
      """ Prompt for and send a message to a channel. """
      channel = input('Which channel would you like to message? ')
      message = input('What should the message be? ')
      channel_id = channel_to_id(slack, channel)
  
      print(f"Sending message to #{channel} (id: {channel_id})!")
      slack.rtm_send_message(channel_id, message)