Updated example code

README.md

@@ -291,7 +291,8 @@ an example on how to specify and solve problem:
                                       Predicate("at", "wolf", "west"),                    
                                       Predicate("at", "boat", "west")}, {});
     problem.domain = Domain(std::string(std::getenv("HOME"))+"/BOAT_DOMAIN");
-    Plan plan = planner(problem);
+    Result result = planner.search(problem);
+    std::cout << planner.get_plan() << std::endl;
 (...)
 ```