v0.2.55..v0.2.56 changeset GeometryModifierOp.h

diff --git a/hoot-core/src/main/cpp/hoot/core/ops/GeometryModifierOp.h b/hoot-core/src/main/cpp/hoot/core/ops/GeometryModifierOp.h
index e537fcf..35d7d24 100644
--- a/hoot-core/src/main/cpp/hoot/core/ops/GeometryModifierOp.h
+++ b/hoot-core/src/main/cpp/hoot/core/ops/GeometryModifierOp.h
@@ -61,6 +61,7 @@ namespace hoot
   public:
 
     GeometryModifierOp();
+    virtual ~GeometryModifierOp() = default;
 
     // OsmMapOperation
     static std::string className() { return "hoot::GeometryModifierOp"; }