Update 2020-12-03.md

Add dschafer

Author: dschafer

agendas/2020-12-03.md

@@ -30,6 +30,7 @@ agenda, edit this file.*
 | Lee Byron                | GraphQL Foundation       | San Francisco, CA, US
 | James Baxley             | Apollo                   | South Carolina, SC, US
 | Michael Staib            | ChilliCream              | Zurich, CH
+| Dan Schafer              | Facebook                 | Menlo Park, CA, US
 | Matt Mahoney             | Facebook                 | New York, NY, US
 | Benjie Gillam ✏️          | Graphile                 | Southampton, UK
 | Evan Huus                | Shopify                  | Ottawa, ON, CA