Update editors list

Author: birtles

Overview.bs

@@ -37,8 +37,9 @@ Repository: w3c/web-animations
 
 Editor: Brian Birtles 43194, Mozilla, bbirtles@mozilla.com
 Editor: Shane Stephens 47691, Google Inc, shans@google.com
-Editor: Alex Danilo 31960, Google Inc, adanilo@google.com
-Editor: Tab Atkins 42199, Google Inc, jackalmage@gmail.com
+Editor: Douglas Stockwell, Google Inc, dstockwell@google.com
+Former Editor: Alex Danilo 31960, Google Inc, adanilo@google.com
+Former Editor: Tab Atkins 42199, Google Inc, jackalmage@gmail.com
 Abstract: This specification defines a model for synchronization and
     timing of changes to the presentation of a Web page.
     This specification also defines an application programming interface