v0.2.55..v0.2.56 changeset AverageNumericTagsVisitor.h

diff --git a/hoot-core/src/main/cpp/hoot/core/visitors/AverageNumericTagsVisitor.h b/hoot-core/src/main/cpp/hoot/core/visitors/AverageNumericTagsVisitor.h
index cebc16c..f91fe83 100644
--- a/hoot-core/src/main/cpp/hoot/core/visitors/AverageNumericTagsVisitor.h
+++ b/hoot-core/src/main/cpp/hoot/core/visitors/AverageNumericTagsVisitor.h
@@ -55,6 +55,7 @@ public:
 
   AverageNumericTagsVisitor();
   explicit AverageNumericTagsVisitor(const QStringList keys);
+  virtual ~AverageNumericTagsVisitor() = default;
 
   /**
    * Given a set of tag keys and for all features having those tags, averages the numerical values