Update web-platform-tests URLs (#101)

Author: foolip

CONTRIBUTING.md

@@ -26,8 +26,8 @@ feature, you can remove yourself with the above syntax.
 # Tests
 
 For normative changes, a corresponding
-[web-platform-tests](https://github.com/w3c/web-platform-tests) PR is highly appreciated. Typically,
+[web-platform-tests](https://github.com/web-platform-tests/wpt) PR is highly appreciated. Typically,
 both PRs will be merged at the same time. Note that a test change that contradicts the spec should
 not be merged before the corresponding spec change. If testing is not practical, please explain why
-and if appropriate [file an issue](https://github.com/w3c/web-platform-tests/issues/new) to follow
+and if appropriate [file an issue](https://github.com/web-platform-tests/wpt/issues/new) to follow
 up later. Add the `type:untestable` or `type:missing-coverage` label as appropriate.

index.bs

@@ -12,7 +12,7 @@ ED: https://w3c.github.io/FileAPI/
 TR: https://www.w3.org/TR/FileAPI/
 Repository: w3c/FileAPI
 Previous Version: https://www.w3.org/TR/2017/WD-FileAPI-20171026/
-!Tests: <a href=https://github.com/w3c/web-platform-tests/tree/master/FileAPI>web-platform-tests FileAPI/</a> (<a href=https://github.com/w3c/web-platform-tests/labels/FileAPI>ongoing work</a>)
+!Tests: <a href=https://github.com/web-platform-tests/wpt/tree/master/FileAPI>web-platform-tests FileAPI/</a> (<a href=https://github.com/web-platform-tests/wpt/labels/FileAPI>ongoing work</a>)
 Abstract: This specification provides an API for representing file objects in web applications,
   as well as programmatically selecting them and accessing their data. This includes:
 

index.html

@@ -1444,7 +1444,7 @@ <h2 class="no-num no-toc no-ref heading settled" id="subtitle"><span class="cont
      <dt class="editor">Former Editor:
      <dd class="editor p-author h-card vcard" data-editor-id="37240"><a class="p-name fn u-url url" href="http://arunranga.com/">Arun Ranganathan</a> (<span class="p-org org">Mozilla Corporation</span>) <a class="u-email email" href="mailto:[email protected]">[email protected]</a>
      <dt>Tests:
-     <dd><a href="https://github.com/w3c/web-platform-tests/tree/master/FileAPI">web-platform-tests FileAPI/</a> (<a href="https://github.com/w3c/web-platform-tests/labels/FileAPI">ongoing work</a>)
+     <dd><a href="https://github.com/web-platform-tests/wpt/tree/master/FileAPI">web-platform-tests FileAPI/</a> (<a href="https://github.com/web-platform-tests/wpt/labels/FileAPI">ongoing work</a>)
     </dl>
    </div>
    <div data-fill-with="warning"></div>