updates for publishing

Author: svgeesus

css-grid-2/Overview.bs

@@ -7,6 +7,8 @@ Group: csswg
 Work Status: testing
 TR: https://www.w3.org/TR/css-grid-2/
 ED: https://drafts.csswg.org/css-grid-2/
+Previous version: https://www.w3.org/TR/2020/CR-css-grid-2-20200818/
+Previous version: https://www.w3.org/TR/2019/WD-css-grid-2-20191203/
 Previous version: https://www.w3.org/TR/2018/WD-css-grid-2-20180804/
 Previous version: https://www.w3.org/TR/2018/WD-css-grid-2-20180628/
 Editor: Tab Atkins Jr., Google, http://www.xanthir.com/contact/, w3cid 42199