Vines request.rb will not work with the newest parser version

Since ff6d81a76df864a576fd5cf0e1540e588f3502bb vines uses
http_parser.rb version 0.6.0. But in the version request_path
and query_string method are gone.

See https://github.com/tmm1/http_parser.rb/commit/303b6b6034aa141cc448192fbc7851a7f9400a91