message: add attribution for html tidy
diff: "name": "MikkTSpace",
  "url": "https://github.com/mmikk/MikkTSpace",
  "license": ["Zlib"]
  + },
  + {
  + "name": "HTML Tidy",
  + "url": "https://github.com/htacg/tidy-html5",
  + "license": ["W3C Software License"]
  }
  ]
  