v0.2.55..v0.2.56 changeset IoSingleStat.h

diff --git a/hoot-core/src/main/cpp/hoot/core/info/IoSingleStat.h b/hoot-core/src/main/cpp/hoot/core/info/IoSingleStat.h
index 8603a0c..a24ca97 100644
--- a/hoot-core/src/main/cpp/hoot/core/info/IoSingleStat.h
+++ b/hoot-core/src/main/cpp/hoot/core/info/IoSingleStat.h
@@ -22,7 +22,7 @@
  * This will properly maintain the copyright information. DigitalGlobe
  * copyrights will be updated automatically.
  *
- * @copyright Copyright (C) 2015, 2018, 2019 DigitalGlobe (http://www.digitalglobe.com/)
+ * @copyright Copyright (C) 2015, 2018, 2019, 2020 DigitalGlobe (http://www.digitalglobe.com/)
  */
 #ifndef IOSINGLESTAT_H
 #define IOSINGLESTAT_H
@@ -48,6 +48,7 @@ public:
   };
 
   IoSingleStat(Type t);
+  virtual ~IoSingleStat() = default;
 };
 
 }