[m-rev.] for post-commit review: add --quiet to update_copyright

[Peter Wang]

On Tue, 13 Feb 2024 11:32:43 +1100 Peter Wang <novalazy at gmail.com> wrote:
> On Tue, 13 Feb 2024 11:04:19 +1100 "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> > For review by Peter.
> > 
> > Zoltan.
> 
> > Add -q/--quiet option to update_copyright.m.
> 
> That's fine.

Oh, you can update the usage info at the top of the file.

Peter