v0.2.55..v0.2.56 changeset DuplicateNodeRemover.h

diff --git a/hoot-core/src/main/cpp/hoot/core/ops/DuplicateNodeRemover.h b/hoot-core/src/main/cpp/hoot/core/ops/DuplicateNodeRemover.h
index 25a1988..6ee8b87 100644
--- a/hoot-core/src/main/cpp/hoot/core/ops/DuplicateNodeRemover.h
+++ b/hoot-core/src/main/cpp/hoot/core/ops/DuplicateNodeRemover.h
@@ -62,6 +62,7 @@ public:
   static std::string className() { return "hoot::DuplicateNodeRemover"; }
 
   DuplicateNodeRemover(Meters distanceThreshold = -1.0);
+  virtual ~DuplicateNodeRemover() = default;
 
   virtual void apply(std::shared_ptr<OsmMap>& map);