code: func (r *EchoResponse) OutputSpeechSSML(text string) *EchoResponse {
  	r.Response.OutputSpeech = &EchoRespPayload{
  		Type: "SSML",
  		SSML: text,
  	}
  
  	return r
  }
docs: // OutputSpeechSSML will add the text string provided and indicate the speech type is SSML in the response.
  // This should only be used if the text to speech string includes special SSML tags.