[css-ui-4] Prep for WD

Author: fantasai

css-ui-4/Overview.bs

@@ -22,8 +22,9 @@ TR: https://www.w3.org/TR/css-ui-4/
 Previous Version: https://www.w3.org/TR/2015/WD-css-ui-4-20150922/
 Shortname: css-ui
 Level: 4
+Date: 2017-12-21
 Group: csswg
-Status: ED
+Status: WD
 Work Status: Revising
 Editor: Florian Rivoal, On behalf of Bloomberg, https://florian.rivoal.net/, w3cid 43241
 Abstract: This specification describes user interface related