'Use this method to unpin a message in a supergroup chat.
The bot must be an administrator in the chat for this to work and must have the appropriate admin rights.
Returns True on success.
:param chat_id: Int or Str: Unique identifier for the target chat or username of the target channel
(in the format @channelusername)
:return:'

def unpin_chat_message(self, chat_id):

    return apihelper.unpin_chat_message(self.token, chat_id)
