Add Alan Cha to participants (#398)

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

Author: Alan-Cha

agendas/2020-05-07.md

@@ -30,6 +30,7 @@ agenda, edit this file.*
 | Benjie Gillam ✏️          | Graphile                 | Southampton, UK
 | Wojciech Trocki          | IBM/Red Hat              | Dublin
 | Terrence Howard          | Individual Contrib       | Washington DC, US
+| Alan Cha ✏️               | IBM Research             | Yorktown Heights, NY, US
 | Vince Foley             | New Relic / Absinthe       | Portland, OR, US
 | Evan Huus                | Shopify                  | Ottawa, ON, CA
 | *ADD YOUR NAME ABOVE TO ATTEND*