Add new record to history. Record will be added to the end

		:param value: new record
		:return: int record position in history

def add(self, value):
		""" Add new record to history. Record will be added to the end

		:param value: new record
		:return: int record position in history
		"""
		index = len(self.__history)
		self.__history.append(value)
		return index