Merge pull request w3c#193 from foolip/link-to-tests

Add a link to web-platform-tests to the top of the spec

Author: birtles

Overview.bs

@@ -33,6 +33,7 @@ Group: fxtf
 !Participate: IRC: <a href="ircs://irc.w3.org:6667/webanimations">#webanimations</a> on W3C's IRC
 Repository: w3c/web-animations
 !Issue Tracking: <a href="https://github.com/w3c/web-animations/issues">GitHub</a>
+!Tests: <a href="https://github.com/w3c/web-platform-tests/tree/master/web-animations">web-platform-tests web-animations/</a> (<a href="https://github.com/w3c/web-platform-tests/labels/web-animations">ongoing work</a>)
 
 Editor: Brian Birtles 43194, Mozilla, bbirtles@mozilla.com
 Editor: Shane Stephens 47691, Google Inc, shans@google.com