message: Remove break after return
  Fix warning about unreacable break. (`-Wunreachable-code-break`)
diff: @@ -73,21 +73,18 @@ Robot* RobotPool::addRobot(RobotType type, int id /*= 0*/)
  mDozers.back()->id(_id);
  mRobots.push_back(mDozers.back());
  return mDozers.back();
  - break;
  case RobotType::ROBOT_DIGGER:
  mDiggers.push_back(new Robodigger());
  mDiggers.back()->id(_id);
  mRobots.push_back(mDiggers.back());
  return mDiggers.back();
  - break;
  case RobotType::ROBOT_MINER:
  mMiners.push_back(new Robominer());
  mMiners.back()->id(_id);
  mRobots.push_back(mMiners.back());
  return mMiners.back();
  - break;
  default:
  break;
  