message: Updating interfaces
  Moving slack specific message properties to slackMessage interface
diff: @@ -221,8 +221,6 @@ declare namespace botkit {
  action?: string;
  channel?: string;
  match?: RegExpMatchArray;
  - replace_original?: boolean;
  - response_type?: string;
  text?: string;
  user?: string;
  }
  @@ -305,6 +303,8 @@ declare namespace botkit {
  link_names?: boolean;
  parse?: string;
  reply_broadcast?: boolean;
  + replace_original?: boolean;
  + response_type?: string;
  type?: string;
  thread_ts?: string;
  ts?: string;
  