Merge: NOTICE: Update author list and years

Commands used:
* `git shortlog -sne <commit range> -- benchmarks/ contrib/ c_src/ examples/ misc/ share/man/ src/ tests/ Changelog LICENSE LICENSE-BSD LICENSE-GPL-2 Makefile NOTICE README.md VERSION .gitattributes .gitignore .gitmodules .mailmap .project`
* `git shortlog -sne <commit range> -- lib/ clib/ share/nitdoc/`
* To check the first commit date of an author: `git log --author=<author BRE> --reverse --date-order | less`

Signed-off-by: Jean-Christophe Beaupré <jcbrinfo@users.noreply.github.com>

Pull-Request: #2120
Reviewed-by: Jean Privat <jean@pryen.org>