v0.2.55..v0.2.56 changeset MultiLineStringVisitor.h

diff --git a/hoot-core/src/main/cpp/hoot/core/visitors/MultiLineStringVisitor.h b/hoot-core/src/main/cpp/hoot/core/visitors/MultiLineStringVisitor.h
index 729e8ee..14397a2 100644
--- a/hoot-core/src/main/cpp/hoot/core/visitors/MultiLineStringVisitor.h
+++ b/hoot-core/src/main/cpp/hoot/core/visitors/MultiLineStringVisitor.h
@@ -53,6 +53,7 @@ public:
   static std::string className() { return "hoot::MultiLineStringVisitor"; }
 
   MultiLineStringVisitor();
+  virtual ~MultiLineStringVisitor() = default;
 
   void setElementProvider(const ConstElementProviderPtr& provider ) { _provider = provider; }