v0.2.55..v0.2.56 changeset CalculateStatsOp.h

diff --git a/hoot-core/src/main/cpp/hoot/core/ops/CalculateStatsOp.h b/hoot-core/src/main/cpp/hoot/core/ops/CalculateStatsOp.h
index a1764b2..0ca4fe4 100644
--- a/hoot-core/src/main/cpp/hoot/core/ops/CalculateStatsOp.h
+++ b/hoot-core/src/main/cpp/hoot/core/ops/CalculateStatsOp.h
@@ -61,6 +61,7 @@ public:
   CalculateStatsOp(QString mapName = "", bool inputIsConflatedMapOutput = false);
   CalculateStatsOp(ElementCriterionPtr criterion, QString mapName = "",
                    bool inputIsConflatedMapOutput = false);
+  virtual ~CalculateStatsOp() = default;
 
   virtual void apply(const OsmMapPtr& map);