Add Oriol Brufau as a CSS Grid editor

As resolved during the Toronto F2F June 2019

Author: Loirooriol

css-grid-1/Overview.bs

@@ -18,6 +18,7 @@ Previous version: https://www.w3.org/TR/2012/WD-css3-grid-layout-20121106/
 Editor: Tab Atkins Jr., Google, http://www.xanthir.com/contact/, w3cid 42199
 Editor: Elika J. Etemad / fantasai, Invited Expert, http://fantasai.inkedblade.net/contact, w3cid 35400
 Editor: Rossen Atanassov, Microsoft, ratan@microsoft.com, w3cid 49885
+Editor: Oriol Brufau, Igalia, obrufau@igalia.com, w3cid 108473
 Former editor: Alex Mogilevsky, Microsoft Corporation, alexmog@microsoft.com
 Former editor: Phil Cupp, Microsoft Corporation, pcupp@microsoft.com
 Issue Tracking: Disposition of Comments https://drafts.csswg.org/css-grid-1/issues