Update authors.yml

Author: pagk2006

_data/authors.yml

@@ -15,7 +15,7 @@ chae:
   name: 채동우
   bio: 연세대 의대
   # avatar: "/assets/images/avatar/chae.jpg"
-  member_group: advisor
+  member_group: president
 cho:
   id: cho
   name: 조혜영
@@ -119,4 +119,4 @@ jwchae:
   id: jwchae
   name: 채정우
   bio: 충남대 약대
-  member_group: member
+  member_group: member