[scroll-animations-1] Add myself as editor of this spec

Author: bramus

scroll-animations-1/Overview.bs

@@ -22,6 +22,7 @@ Editor: Antoine Quint, Apple, graouts@apple.com, w3cid 51377
 Editor: Olga Gerchikov, Microsoft, gerchiko@microsoft.com, w3cid 121763
 Editor: Elika J. Etemad / fantasai, Apple, http://fantasai.inkedblade.net/contact, w3cid 35400
 Editor: Robert Flack, Google, w3cid 98451
+Editor: Bramus Van Damme, Google, https://www.bram.us/about/, w3cid 137581
 
 Former Editor: Majid Valipour, Google, majidvp@google.com, w3cid 81464
 Former editor: Mantaroh Yoshinaga