Update copyright year.

Thomas Munro <tmunro@postgresql.org>

Commit: 4c9210f34c621639f896d57cf7bfb5e9be139c91
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2019-05-24T00:03:32Z
Releases: 12.0
Update copyright year.

Reviewed-by: Michael Paquier
Discussion: https://postgr.es/m/CA%2BhUKGJFWXmtYo6Frd77RR8YXCHz7hJ2mRy5aHV%3D7fJOqDnBHA%40mail.gmail.com

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