code: public static Stream<Link> getMementoLinks(final String identifier, final List<VersionRange> mementos) {
          return concat(getTimeMap(identifier, mementos.stream()), mementos.stream().map(mementoToLink(identifier)));
      }
docs: Retrieve all of the Memento-related link headers given a stream of VersionRange objects
  @param identifier the public identifier for the resource
  @param mementos a stream of memento values
  @return a stream of link headers