waitNewChatMembersEvents

suspend fun BehaviourContext.waitNewChatMembersEvents(    initRequest: Request<*>? = null,     errorFactory: NullableRequestBuilder<*> = { null },     count: Int = 1,     filter: SimpleFilter<ChatEventMessage<NewChatMembers>>? = null,     mapper: EventMessageToEventMapper<NewChatMembers>? = null): List<NewChatMembers>