message: Also add room_id to cache on invite join
diff: @@ -165,11 +165,12 @@ export class MatrixRoomHandler {
  await this.bridge.getRoomStore().removeEntriesByMatrixRoomId(roomId);
  }
  - public HandleInvite(event: any) {
  + public async HandleInvite(event: any) {
  log.info("Received invite for " + event.state_key + " in room " + event.room_id);
  if (event.state_key === this.botUserId) {
  log.info("Accepting invite for bridge bot");
  - return this.joinRoom(this.bridge.getIntent(), event.room_id);
  + await this.joinRoom(this.bridge.getIntent(), event.room_id);
  + this.botJoinedRooms.add(event.room_id);
  } else {
  return this.discord.ProcessMatrixStateEvent(event);
  }
  