[css-color-4] Add Lea Verou as editor, per WG resolution

Author: LeaVerou

css-color-4/Overview.bs

@@ -12,6 +12,7 @@ Level: 4
 Implementation Report: https://test.csswg.org/harness/results/css-color-4_dev/grouped/
 Editor: Tab Atkins Jr., Google, http://xanthir.com/contact, w3cid 42199
 Editor: Chris Lilley, W3C, https://svgees.us/, w3cid 1438
+Editor: Lea Verou, Invited Expert, http://lea.verou.me/, w3cid 52258
 Former Editor: L. David Baron, Mozilla https://www.mozilla.org/, https://dbaron.org/, w3cid 15393
 Abstract: This specification describes CSS <<color>> values and properties for foreground color and group opacity.
 Repository: w3c/csswg-drafts