[PATCH 2 of 2 stable] debian: update copyright years

[Augie Fackler]

On Sun, Feb 12, 2017 at 06:15:39PM -0500, timeless wrote:
> We should really write a test for this sort of thing. Yes it's a bit
> silly, but it'd be helpful to catch it faster than 13 months late...

Sure, but carefully, for the reasons expressed in
https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-February/092837.html.

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