[Integrated] RFR: 8237504: Update copyright header for files modified in 2020

[Kevin Rushforth]

On Thu, 30 Apr 2020 22:49:32 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Update last modified year of copyright headers for files modified in 2020.

This pull request has now been integrated.

Changeset: 2b9eb52e
Author:    Kevin Rushforth <kcr at openjdk.org>
URL:       https://git.openjdk.java.net/jfx/commit/2b9eb52e
Stats:     144 lines in 144 files changed: 0 ins; 0 del; 144 mod

8237504: Update copyright header for files modified in 2020

Reviewed-by: arapte

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PR: https://git.openjdk.java.net/jfx/pull/203