Add Matt Mahoney (#445)

Co-authored-by: Lee Byron <[email protected]>

Author: mjmahone

agendas/2020-07-02.md

@@ -34,6 +34,7 @@ agenda, edit this file.*
 | Jesse Rosenberger        | Apollo                   | Helsinki, FI
 | Michael Staib            | ChilliCream              | Zurich, CH
 | Jason Kuhrt              | Nexus                    | Montreal, QC, CA
+| Matt Mahoney             | Facebook                 | New York, NY, US
 | Evan Huus                | Shopify                  | Ottawa, ON, CA
 | Andi Marek              | GraphQL-Java                    | Sydney, Australien
 | *ADD YOUR NAME ABOVE TO ATTEND*