UserInfo의 UserStatus에 Key 추가

@@ -9,7 +9,7 @@ interface UserInfoProps {
 export const UserInfo: React.FC<UserInfoProps> = ({ users }) => {
   return (
     <div className='w-7/12 h-60 flex justify-center'>
-      {users.map((user) => (<UserStatus user={user} />))}
+      {users.map((user) => (<UserStatus key={user.username} user={user} />))}
     </div>
   );
 }
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