message: use alt_aliases instead of aliases to match a pill to a room
  when deserializing a pill
diff: @@ -428,7 +428,8 @@ export class PartCreator {
  room = this._client.getRoom(roomId || alias);
  } else {
  room = this._client.getRooms().find((r) => {
  - return r.getCanonicalAlias() === alias || r.getAliases().includes(alias);
  + return r.getCanonicalAlias() === alias ||
  + r.getAltAliases().includes(alias);
  });
  }
  return new RoomPillPart(alias, room);
  