[css-animations-2] Add self to editors list for CSS Animations 2

Author: birtles

css-animations-2/Overview.bs

@@ -43,6 +43,7 @@ Level: 2
 Group: csswg
 ED: https://drafts.csswg.org/css-animations-2/
 Editor: L. David Baron, Mozilla, dbaron@dbaron.org
+Editor: Brian Birtles, Mozilla https://www.mozilla.org/, bbirtles@mozilla.com
 !Issues List: <a href="https://www.w3.org/Bugs/Public/buglist.cgi?component=Animations&list_id=36653&product=CSS&query_format=advanced&resolution=---">In Bugzilla</a>
 
 Abstract: This CSS module describes a way for authors to animate the values of CSS properties over time, using keyframes. The behavior of these keyframe animations can be controlled by specifying their duration, number of repeats, and repeating behavior.