v0.2.55..v0.2.56 changeset HighwayMergerCreator.h

diff --git a/hoot-core/src/main/cpp/hoot/core/conflate/highway/HighwayMergerCreator.h b/hoot-core/src/main/cpp/hoot/core/conflate/highway/HighwayMergerCreator.h
index be56e34..4e4954b 100644
--- a/hoot-core/src/main/cpp/hoot/core/conflate/highway/HighwayMergerCreator.h
+++ b/hoot-core/src/main/cpp/hoot/core/conflate/highway/HighwayMergerCreator.h
@@ -41,6 +41,7 @@ public:
   static std::string className() { return "hoot::HighwayMergerCreator"; }
 
   HighwayMergerCreator();
+  virtual ~HighwayMergerCreator() = default;
 
   /**
    * If there is a single HighwayMatch, a single HighwayMergerCreator will be created and returned.