message: use array includes() instead of indexOf()
diff: @@ -170,9 +170,9 @@ export class MatrixEventProcessor {
  "m.video",
  "m.file",
  "m.sticker",
  - ].indexOf(event.content.msgtype) !== -1 || [
  + ].includes(event.content.msgtype) || [
  "m.sticker",
  - ].indexOf(event.type) !== -1;
  + ].includes(event.type);
  if (!hasAttachment) {
  return "";
  }
  