Update NOTICE to 2021
diff --git a/NOTICE.txt b/NOTICE.txt
index 95d5e75..d00085d 100644
--- a/NOTICE.txt
+++ b/NOTICE.txt
@@ -1,5 +1,5 @@
 Apache Commons Statistics
-Copyright 2018-2020 The Apache Software Foundation
+Copyright 2018-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).
diff --git a/commons-statistics-distribution/NOTICE.txt b/commons-statistics-distribution/NOTICE.txt
index 95d5e75..d00085d 100644
--- a/commons-statistics-distribution/NOTICE.txt
+++ b/commons-statistics-distribution/NOTICE.txt
@@ -1,5 +1,5 @@
 Apache Commons Statistics
-Copyright 2018-2020 The Apache Software Foundation
+Copyright 2018-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).
diff --git a/commons-statistics-regression/NOTICE.txt b/commons-statistics-regression/NOTICE.txt
index 95d5e75..d00085d 100644
--- a/commons-statistics-regression/NOTICE.txt
+++ b/commons-statistics-regression/NOTICE.txt
@@ -1,5 +1,5 @@
 Apache Commons Statistics
-Copyright 2018-2020 The Apache Software Foundation
+Copyright 2018-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).