DOC: fix link to Compare 2016 paper

[hagenw]

fix a broken link in the documentation to the PDF of the paper on the Interspeech 2016 Compare challenge.

Summary by Sourcery

Documentation:

• Replace outdated ComParE 2016 paper URL with the new livrepository.liverpool.ac.uk link

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Refined the ComParE 2016 paper link in documentation by replacing the outdated external URL with the updated LivRepository PDF link.

File-Level Changes

Change	Details	Files
Updated the documentation link for the ComParE 2016 paper	Replaced the old tangsoo.de URL with the new livrepository.liverpool.ac.uk PDF link	opensmile/core/define.py

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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