scripted-diff: Bump copyright of files changed in 2019

-BEGIN VERIFY SCRIPT-
./contrib/devtools/copyright_header.py update ./
-END VERIFY SCRIPT-

contrib/linearize/linearize-data.py

@@ -2,7 +2,7 @@
 #
 # linearize-data.py: Construct a linear, no-fork version of the chain.
 #
-# Copyright (c) 2013-2018 The Bitcoin Core developers
+# Copyright (c) 2013-2019 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #

contrib/linearize/linearize-hashes.py

@@ -2,7 +2,7 @@
 #
 # linearize-hashes.py:  List blocks in a linear, no-fork version of the chain.
 #
-# Copyright (c) 2013-2018 The Bitcoin Core developers
+# Copyright (c) 2013-2019 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #