[css-color-5] updates for publication

Author: svgeesus

css-color-5/Overview.bs

@@ -2,7 +2,9 @@
 Title: CSS Color Module Level 5
 Shortname: css-color
 Level: 5
-Status: ED
+Status: WD
+Prepare for TR: yes
+Date: 2021-06-01
 Group: csswg
 TR: https://www.w3.org/TR/css-color-5/
 ED: https://drafts.csswg.org/css-color-5/