message: fixing vector access in accelerate label
diff: @@ -25,7 +25,7 @@ LabelMap EgoAccelerateLabelFunction::Evaluate(
  const auto ego = observed_world.GetEgoAgent();
  const auto& history = ego->GetStateInputHistory();
  if (history.size() > 2) {
  - const auto dx = history.end()->first - (history.end() - 2)->first;
  + const auto dx = history.back()->first - (history.back() - 1)->first;
  const float dv = dx(StateDefinition::VEL_POSITION);
  const float dt = dx(StateDefinition::TIME_POSITION);
  const float avg_accel = dv / dt;
  