old_contents: from http_client import HttpClient
  
  """
  @breif Facebook messenger bot
  """
  class Bot():
  
      def __init__(self, token):
          self.api_token = token
          self.client = HttpClient()   
  
      def send_message(self, message, completion):
  
          def completion(response, error):
              if error is None:
                  # TODO: Is there anything the bot needs to do?
                  # maybe retry if it fails...?
                  pass
              else:
                  completion()
  
          self.client.submit_request('/me/messages', 
              'POST', 
              message.to_json(), 
              completion)
  
      def handle_incoming():
          raise NotImplementedError
  
new_contents: from http_client import HttpClient
  
  class Bot():
      """
      @breif Facebook messenger bot
      """
  
      def __init__(self, token):
          self.api_token = token
          self.client = HttpClient()
  
      def send_message(self, message, completion):
  
          def completion(response, error):
              if error is None:
                  # TODO: Is there anything the bot needs to do?
                  # maybe retry if it fails...?
                  pass
              else:
                  completion()
  
          self.client.submit_request('/me/messages', 
              'POST', 
              message.to_json(), 
              completion)
  
subject: Remove ability to recieve messages