[css-inline-3] Update prev version

Author: fantasai

css-inline-3/Overview.bs

@@ -8,11 +8,11 @@ Title: CSS Inline Layout Module Level 3
 Shortname: css-inline
 Level: 3
 Status: WD
-Date: 2018-08-07
 Work Status: Revising
 Group: csswg
 TR: https://www.w3.org/TR/css-inline-3/
 ED: https://drafts.csswg.org/css-inline-3/
+Previous version: https://www.w3.org/TR/2018/WD-css-inline-3-20180808/
 Previous version: https://www.w3.org/TR/2016/WD-css-inline-3-20160524/
 Previous version: https://www.w3.org/TR/2015/WD-css-inline-3-20150917/
 Previous version: https://www.w3.org/TR/2014/WD-css-inline-3-20141218/