[css-lists-3] Update for publication

Author: fantasai

css-lists-3/Overview.bs

@@ -11,6 +11,7 @@ Editor: Elika J. Etemad / fantasai, Invited Expert, http://fantasai.inkedblade.n
 Editor: Tab Atkins, Google, http://xanthir.com/contact/, w3cid 42199
 Former Editor: Ian Hickson, Google, ian@hixie.ch
 Former Editor: Tantek Çelı̇k, Formerly of Microsoft, tantekc@microsoft.com
+Previous Version: https://www.w3.org/TR/2020/WD-css-lists-3-20200709/
 Previous Version: https://www.w3.org/TR/2019/WD-css-lists-3-20190817/
 Previous Version: https://www.w3.org/TR/2019/WD-css-lists-3-20190425/
 Previous Version: https://www.w3.org/TR/2014/WD-css-lists-3-20140320/