[css-device-adapt] Add Matt as co-editor

Author: frivoal

css-device-adapt/Overview.bs

@@ -10,6 +10,7 @@ ED: https://drafts.csswg.org/css-device-adapt/
 Previous Version: http://www.w3.org/TR/2011/WD-css-device-adapt-20110915/
 Editor: Rune Lillesveen, Opera Software, rune@opera.com
 Editor: Florian Rivoal, Invited Expert, florian@rivoal.net, http://florian.rivoal.net
+Editor: Matt Rakow, Microsoft
 Former Editor: Ryan Betts, Adobe Systems, rbetts@adobe.com
 Former Editor: Øyvind Stenhaug, Opera Software, oyvinds@opera.com
 Abstract: This specification provides a way for an author to specify, in CSS, the size, zoom factor, and orientation of the viewport that is used as the base for the initial containing block.