doc(notice): update copyright year to 2019.

doc(notice): update copyright year to 2019.
diff --git a/NOTICE b/NOTICE
index 703c28b..85e2dc3 100644
--- a/NOTICE
+++ b/NOTICE
@@ -1,5 +1,5 @@
 Apache RocketMQ
-Copyright 2016-2018 The Apache Software Foundation
+Copyright 2016-2019 The Apache Software Foundation
 
 This product includes software developed at
-The Apache Software Foundation (http://www.apache.org/).
\ No newline at end of file
+The Apache Software Foundation (http://www.apache.org/).