[css-tables-3] mark Keith Cirkel (myself) as editor (#13161)

Author: keithamus

css-tables-3/Overview.bs

@@ -11,8 +11,9 @@ Previous Version: https://www.w3.org/TR/2019/WD-css-tables-3-20190727/
 Previous Version: https://www.w3.org/TR/CSS2/tables.html
 Repository: w3c/csswg-drafts
 Warning: not ready
-Editor: François Remy, Invited Expert, w3cid 53348
-Editor: Greg Whitworth, Microsoft, w3cid 69511
+Editor: Keith Cirkel, Mozilla, w3cid 146197
+Former Editor: François Remy, Invited Expert, w3cid 53348
+Former Editor: Greg Whitworth, Microsoft, w3cid 69511
 Former editor: Bert Bos, W3C
 Former Editor: L. David Baron, Google https://www.google.com/, https://dbaron.org/, w3cid 15393
 Former editor: Markus Mielke, Microsoft