code: public Traverson follow(final List<String> rels, 
                              final Map<String, Object> vars) {
          for (String rel : rels) {
              follow(rel, always(), vars);
          }
          return this;
      }
docs: Follow multiple link-relation types, one by one.
  <p>
  Templated links are expanded to URIs using the specified template variables.
  </p>
  <p>
  Embedded items are used instead of resolving links, if present in the returned HAL documents.
  </p>
  
  @param rels the link-relation types of the followed links
  @param vars uri-template variables used to build links.
  @return this
  @since 1.0.0