Update my copyright years.

Gbp-Dch: ignore

diffoscope/comparators/fit.py

@@ -3,6 +3,7 @@
 # diffoscope: in-depth comparison of files, archives, and directories
 #
 # Copyright © 2020-2021 Conrad Ratschan <ratschance@gmail.com>
+# Copyright © 2021 Chris Lamb <lamby@debian.org>
 #
 # diffoscope is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by

tests/comparators/test_apk.py

@@ -2,7 +2,7 @@
 # diffoscope: in-depth comparison of files, archives, and directories
 #
 # Copyright © 2017 Maria Glukhova <siammezzze@gmail.com>
-# Copyright © 2017, 2019-2020 Chris Lamb <lamby@debian.org>
+# Copyright © 2017, 2019-2021 Chris Lamb <lamby@debian.org>
 #
 # diffoscope is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by

tests/comparators/test_fit.py

@@ -3,6 +3,7 @@
 # diffoscope: in-depth comparison of files, archives, and directories
 #
 # Copyright © 2020 Conrad Ratschan <ratschance@gmail.com>
+# Copyright © 2021 Chris Lamb <lamby@debian.org>
 #
 # diffoscope is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by

tests/test_source.py

 #
 # diffoscope: in-depth comparison of files, archives, and directories
 #
-# Copyright © 2018-2020 Chris Lamb <lamby@debian.org>
+# Copyright © 2018-2021 Chris Lamb <lamby@debian.org>
 #
 # diffoscope is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by