[annual copyright updater]. Bugfix: do not touch symbolic links

Created by: muffato

Use case

The previous version of the script processes all symbolic links (-R option of grep) but sed then turns the links into real files.

Description

Use the -r option to not follow symbolic links.

Benefits

The script won't break symbolic links.

Possible Drawbacks

None

Testing

Have you added/modified unit tests to test the changes?

No

If so, do the tests pass/fail?

Have you run the entire test suite and no regression was detected?

No