v0.2.55..v0.2.56 changeset NetworkMerger.h

diff --git a/hoot-core/src/main/cpp/hoot/core/conflate/network/NetworkMerger.h b/hoot-core/src/main/cpp/hoot/core/conflate/network/NetworkMerger.h
index 9512872..295b0a7 100644
--- a/hoot-core/src/main/cpp/hoot/core/conflate/network/NetworkMerger.h
+++ b/hoot-core/src/main/cpp/hoot/core/conflate/network/NetworkMerger.h
@@ -47,7 +47,8 @@ public:
 
   static std::string className() { return "hoot::NetworkMerger"; }
 
-  NetworkMerger();
+  NetworkMerger() = default;
+  virtual ~NetworkMerger() = default;
   /**
    * Constructed with a set of element matching pairs. The pairs are generally Unknown1 as first
    * and Unknown2 as second.