v0.2.55..v0.2.56 changeset FeatureCountVisitor.h

diff --git a/hoot-core/src/main/cpp/hoot/core/visitors/FeatureCountVisitor.h b/hoot-core/src/main/cpp/hoot/core/visitors/FeatureCountVisitor.h
index 709d246..2e016f8 100644
--- a/hoot-core/src/main/cpp/hoot/core/visitors/FeatureCountVisitor.h
+++ b/hoot-core/src/main/cpp/hoot/core/visitors/FeatureCountVisitor.h
@@ -44,7 +44,8 @@ public:
 
   static std::string className() { return "hoot::FeatureCountVisitor"; }
 
-  FeatureCountVisitor() : _count(0) {}
+  FeatureCountVisitor() : _count(0) { }
+  virtual ~FeatureCountVisitor() = default;
 
   int getCount() const { return _count; }