code: def update_value(self, id_number, new_value, metadata=None):
          
          data = {
              'id': id_number,
              'new_value': new_value
          }
  
          if metadata is not None:
              data['metadata'] = metadata
  
          return self.post('updateValue', data)
docs: Update a canned value
  
          :type id_number: int
          :param id_number: canned value ID number
  
          :type new_value: str
          :param new_value: New canned value value
  
          :type metadata: str
          :param metadata: Optional metadata
  
          :rtype: dict
          :return: an empty dictionary