Removing mercurial support for update-copyright-year script

[Sonia Zaldana Calles]

Hi folks,

I'm working on JDK-8333685 [0].

I was wondering if there would be any objections to removing mercurial
support from this script along with the few other improvements suggested in
the issue above.

Looking forward to your thoughts.

Cheers,
Sonia


[0] https://bugs.openjdk.org/browse/JDK-8333685

-- 
Sonia Zaldaña Calles
Software Engineer, OpenJDK
Red Hat
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