message: show a pill as a moderated alias (canonical or alt) if available
  otherwise, display as the label in the link
diff: @@ -237,7 +237,15 @@ const Pill = createReactClass({
  case Pill.TYPE_ROOM_MENTION: {
  const room = this.state.room;
  if (room) {
  - linkText = (room ? getDisplayAliasForRoom(room) : null) || resource;
  + const isModeratedAlias = room.getCanonicalAlias() === resource ||
  + room.getAltAliases().includes(resource);
  + if (!isModeratedAlias) {
  + linkText = getDisplayAliasForRoom(room);
  + }
  + // if there are no moderated aliases, stick to resource
  + if (!linkText) {
  + linkText = resource;
  + }
  if (this.props.shouldShowPillAvatar) {
  avatar = <RoomAvatar room={room} width={16} height={16} aria-hidden="true" />;
  }
  