[css-text-decor-3] Prep for CR publication

Author: fantasai

css-text-decor-3/Overview.bs

@@ -3,7 +3,8 @@ Title: CSS Text Decoration Module Level 3
 Shortname: css-text-decor
 Level: 3
 Status: CR
-Deadline: 2018-12-11
+Date: 2018-06-26
+Deadline: 2018-12-31
 Work Status: Testing
 Group: csswg
 ED: https://drafts.csswg.org/css-text-decor-3/