Add AMAZON.RepeatIntent?

[mmonimon]

Since answers can be a bit confusing

    def handle(self, handler_input):
        # type: (HandlerInput) -> Response
        logger.info("In RepeatHandler")
        attr = handler_input.attributes_manager.session_attributes
        response_builder = handler_input.response_builder
        if "recent_response" in attr:
            cached_response_str = json.dumps(attr["recent_response"])
            cached_response = DefaultSerializer().deserialize(
                cached_response_str, Response)
            return cached_response
        else:
            response_builder.speak(data.FALLBACK_ANSWER).ask(data.HELP_MESSAGE)

            return response_builder.response

from https://github.com/alexa/skill-sample-python-quiz-game/blob/master/lambda/py/lambda_function.py#L364