code: public CompletionStage<ResponseBuilder> updateMemento(final ResponseBuilder builder) {
          return getServices().getMementoService().put(getServices().getResourceService(), getInternalId())
              .exceptionally(ex -> {
                      LOGGER.warn("Unable to store memento for {}: {}", getInternalId(), ex.getMessage());
                      return null;
                  })
              .thenApply(stage -> builder);
      }
docs: Update the memento resource.
  
  @param builder the Trellis response builder
  @return a response builder promise