Update NOTICE file for 2019.
diff --git a/NOTICE.txt b/NOTICE.txt
index 3e00480..ac92d31 100644
--- a/NOTICE.txt
+++ b/NOTICE.txt
@@ -1,5 +1,5 @@
 Apache Commons Weaver
-Copyright 2012-2018 The Apache Software Foundation
+Copyright 2012-2019 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).