See: https://www.gnu.org/licenses/gpl-3.0.html#howto
Run:
$ git grep -l 'Foundation; either version 3' \
| xargs sed -i '/Foundation; either version 3/ s/n; e/n, e/'
* All files using GPLv3: Adjust via the above command.
After running ‘make update-copyright’ I noticed that it
incorrectly replaced a couple of symlinks with their contents.
* Makefile (update-copyright): Do not update symlinks.
* etc/license-notices/GPL, etc/license-notices/LGPL:
Change these back to symlinks.
