message: Use conversations.open in place of im.open
diff: @@ -100,7 +100,7 @@ export class SlackBotWorker extends BotWorker {
  */
  public async startPrivateConversation(userId: string): Promise<any> {
  // create the new IM channel
  - const channel: any = await this.api.im.open({ user: userId });
  + const channel: any = await this.api.conversations.open({ users: userId });
  if (channel.ok === true) {
  // now, switch contexts
  