message: Add Tony Valderrama to contributors list.
diff: "brian ruddy <briancruddy@gmail.com> (https://github.com/bcruddy)",
  "Emil Persson <emil.n.persson@gmail.com> (https://github.com/emilniklas)",
  "Ihor Chulinda <ichulinda@gmail.com> (https://github.com/Igmat)",
  - "OJ Kwon <kwon.ohjoong@gmail.com> (https://github.com/kwonoj)"
  + "OJ Kwon <kwon.ohjoong@gmail.com> (https://github.com/kwonoj)",
  + "Tony Valderrama <tony.valderrama@outlook.com> (https://github.com/tvald)"
  ],
  "license": "MIT",
  "bugs": {
  