Add @defer and @stream to 02/2020 agenda (graphql#356)

Co-authored-by: Lee Byron <lee@leebyron.com>

agendas/2020-02-06.md

@@ -28,6 +28,8 @@ agenda, edit this file.*
 | Matt Farmer              | Individual Contrib       | Oakland, CA, US
 | Michael Staib            | ChilliCream              | Zurich, CH
 | Rafael Staib             | ChilliCream              | Zurich, CH
+| Kewei Qu                 | Facebook                 | New York, NY, US
+| Jafar Husain             | Facebook                 | Menlo Park, CA, US
 | Alan Cha ✏               | IBM Research             | Yorktown Heights, NY, US
 | Orta Therox              | Microsoft / me           | San Francisco, CA, US
 | Benjie Gillam ✏          | GraphiQL / Graphile      | Southampton, UK
@@ -65,5 +67,6 @@ Example agenda item:
    - [Custom Scalar Specification URIs RFC Issue](https://github.com/graphql/graphql-spec/issues/635)
    - [Custom Scalar Specification URIs RFC PR](https://github.com/graphql/graphql-spec/pull/649)
    - [GraphQL.js PR](https://github.com/graphql/graphql-js/pull/2276/files)
+1. Discuss @defer and @stream [strawman proposal and questions in the comment](https://github.com/graphql/graphql-spec/pull/679) (30m, Kewei, Jafar, Jennifer)
 1.  I'd like to get an idea of what people want from the website redesign (10m, Orta)
 1. *ADD YOUR AGENDA ABOVE*