v0.2.55..v0.2.56 changeset MarkForReviewMerger.h

diff --git a/hoot-core/src/main/cpp/hoot/core/conflate/merging/MarkForReviewMerger.h b/hoot-core/src/main/cpp/hoot/core/conflate/merging/MarkForReviewMerger.h
index 6b92c4b..e8ae6e6 100644
--- a/hoot-core/src/main/cpp/hoot/core/conflate/merging/MarkForReviewMerger.h
+++ b/hoot-core/src/main/cpp/hoot/core/conflate/merging/MarkForReviewMerger.h
@@ -45,7 +45,9 @@ public:
 
   static std::string className() { return "hoot::MarkForReviewMerger"; }
 
-  MarkForReviewMerger();
+  MarkForReviewMerger() = default;
+  virtual ~MarkForReviewMerger() = default;
+
   /**
    * Constructed with a set of element matching pairs. The pairs are generally Unknown1 as first
    * and Unknown2 as second.