v0.2.55..v0.2.56 changeset NumericStatistic.h

diff --git a/hoot-core/src/main/cpp/hoot/core/info/NumericStatistic.h b/hoot-core/src/main/cpp/hoot/core/info/NumericStatistic.h
index 5625686..4e655c6 100644
--- a/hoot-core/src/main/cpp/hoot/core/info/NumericStatistic.h
+++ b/hoot-core/src/main/cpp/hoot/core/info/NumericStatistic.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 NUMERIC_STATISTIC_H
 #define NUMERIC_STATISTIC_H
@@ -42,7 +42,8 @@ class NumericStatistic : public SingleStatistic
 {
 public:
 
-  virtual ~NumericStatistic() {}
+  NumericStatistic() = default;
+  virtual ~NumericStatistic() = default;
 
   virtual long numWithStat() const = 0;
   virtual double getMin() const = 0;