[css-animations-1] Update TR link to point to new versioned URL

Author: birtles

css-animations-1/Overview.bs

@@ -18,7 +18,7 @@ Work Status: Refining
 Shortname: css-animations
 Level: 1
 Group: csswg
-TR: https://www.w3.org/TR/css3-animations/
+TR: https://www.w3.org/TR/css-animations-1/
 ED: https://drafts.csswg.org/css-animations/
 Previous Version: https://www.w3.org/TR/2013/WD-css3-animations-20130219/
 Previous Version: https://www.w3.org/TR/2012/WD-css3-animations-20120403/