v0.2.55..v0.2.56 changeset FieldDefinition.h

diff --git a/hoot-core/src/main/cpp/hoot/core/io/schema/FieldDefinition.h b/hoot-core/src/main/cpp/hoot/core/io/schema/FieldDefinition.h
index e7d9398..5d86068 100644
--- a/hoot-core/src/main/cpp/hoot/core/io/schema/FieldDefinition.h
+++ b/hoot-core/src/main/cpp/hoot/core/io/schema/FieldDefinition.h
@@ -59,6 +59,7 @@ public:
   };
 
   FieldDefinition();
+  virtual ~FieldDefinition() = default;
 
   virtual bool getAllowNull() const { return _allowNull; }