Bernhard Voelker f7ea96d2b8 maint: update copyright year number ranges
Run 'make update-copyright'.

* lib/regexprops.c (copying): Update the year number manually.
* tests/sample-test: Likewise, here to avoid starting a year number range.
* All other files: Update copyright years via the above make run.
2020-01-01 16:22:52 +01:00
..
2016-02-16 23:27:44 +01:00