message: python wrapping AtGoal Agent
diff: @@ -61,6 +61,7 @@ void python_agent(py::module m) {
  .def("IsValidAtTime", &Agent::IsValidAtTime)
  .def("SetAgentId", &Object::SetAgentId)
  .def("GenerateRoadCorridor", &Agent::GenerateRoadCorridor)
  + .def("AtGoal", &Agent::AtGoal)
  .def(py::pickle(
  [](const Agent& a) -> py::tuple {
  return py::make_tuple(
  