Bump copyright years to 2019. (GH-11404)

diff --git a/README.rst b/README.rst
index 184ddb8..6a70f6c 100644
--- a/README.rst
+++ b/README.rst
@@ -22,7 +22,7 @@
    :target: https://python.zulipchat.com
 
 
-Copyright (c) 2001-2018 Python Software Foundation.  All rights reserved.
+Copyright (c) 2001-2019 Python Software Foundation.  All rights reserved.
 
 See the end of this file for further copyright and license information.
 
@@ -249,7 +249,7 @@
 Copyright and License Information
 ---------------------------------
 
-Copyright (c) 2001-2018 Python Software Foundation.  All rights reserved.
+Copyright (c) 2001-2019 Python Software Foundation.  All rights reserved.
 
 Copyright (c) 2000 BeOpen.com.  All rights reserved.