Adding Matt Mahoney to December 2020 WG

Also attempting to add in the correct alpha-sorting position used from past WG agendas, which seems to be sorted by Lee + Brian first, then company alphabetically, then first name.

Author: mjmahone

agendas/2020-12-03.md

@@ -28,6 +28,7 @@ agenda, edit this file.*
 | Name                     | Organization / Project   | Location
 | ------------------------ | ------------------------ | ------------------------
 | Lee Byron                | GraphQL Foundation       | San Francisco, CA, US
+| Matt Mahoney             | Facebook                 | New York, NY, US
 | Benjie Gillam ✏️         | Graphile                 | Southampton, UK
 | Mark Larah               | Yelp                     | San Francisco, CA, US
 | Yogesh Desai             | Tokopedia                | Pune, India