RATIS-642. Bump the copyright year of the NOTICE.txt. Contributed by Mukul Kumar Singh.
diff --git a/NOTICE b/NOTICE
index e6c5b45..89f3e2c 100644
--- a/NOTICE
+++ b/NOTICE
@@ -1,5 +1,5 @@
 Apache Ratis
-Copyright 2017-2018 The Apache Software Foundation
+Copyright 2018-2019 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).