v0.2.55..v0.2.56 changeset BuildingHeightVisitor.h

diff --git a/hoot-core/src/main/cpp/hoot/core/visitors/BuildingHeightVisitor.h b/hoot-core/src/main/cpp/hoot/core/visitors/BuildingHeightVisitor.h
index 51e21a0..29bf8cd 100644
--- a/hoot-core/src/main/cpp/hoot/core/visitors/BuildingHeightVisitor.h
+++ b/hoot-core/src/main/cpp/hoot/core/visitors/BuildingHeightVisitor.h
@@ -48,6 +48,7 @@ public:
   static int logWarnCount;
 
   BuildingHeightVisitor();
+  virtual ~BuildingHeightVisitor() = default;
 
   virtual void visit(const ConstElementPtr& e) override;