selectFriends

fun PickerClient.selectFriends(context: Context, params: PickerFriendRequestParams, callback: (selectedUsers: SelectedUsers?, error: Throwable?) -> Unit)
fun RxPickerClient.selectFriends(context: Context, params: PickerFriendRequestParams): Single<SelectedUsers>

풀 스크린 형태의 멀티 피커 요청
Requests a multi-picker in full-screen view