Welcome new WebPlat editors

Hello WebPlat,

A warm welcome to four new WebPlat editors...

Tobie Langel (IE) as editor for WebIDL, Sangwhan Moon (IE) as editor for 
Web Workers and HTML, Yongsheng Zhu (Alibaba) as editor for DOM, and 
Brandon Jones (Google) as editor for Gamepad API.

Please do all you can to support each of them, and all the WebPlat 
editors. Reviewing specs, filing issues, discussing solutions and 
submitting PRs all make the life of editors much happier.

Thanks.
Léonie on behalf of the WebPlat chairs and team
-- 
@LeonieWatson tink.uk Carpe diem