v0.2.55..v0.2.56 changeset NormalizePhoneNumbersVisitor.h

diff --git a/hoot-core/src/main/cpp/hoot/core/visitors/NormalizePhoneNumbersVisitor.h b/hoot-core/src/main/cpp/hoot/core/visitors/NormalizePhoneNumbersVisitor.h
index a62a426..57fdd6a 100644
--- a/hoot-core/src/main/cpp/hoot/core/visitors/NormalizePhoneNumbersVisitor.h
+++ b/hoot-core/src/main/cpp/hoot/core/visitors/NormalizePhoneNumbersVisitor.h
@@ -45,7 +45,8 @@ public:
 
   static std::string className() { return "hoot::NormalizePhoneNumbersVisitor"; }
 
-  NormalizePhoneNumbersVisitor();
+  NormalizePhoneNumbersVisitor() = default;
+  virtual ~NormalizePhoneNumbersVisitor() = default;
 
   virtual void setConfiguration(const Settings& conf);