Google Code-in

See https://phabricator.wikimedia.org/T76294 for more info

Pywikibot is a Python-based framework to write bots for MediaWiki. See https://www.mediawiki.org/wiki/Manual:Pywikibot for more info. Patches should be submitted via Gerrit (you need a MediaWiki.org account). See https://www.mediawiki.org/wiki/Manual:Pywikibot/Gerrit. After you have successfully claimed this task on this site please do use the task in Phabricator for communication instead. This allows more PWB developers to be reached! General dev questions can be asked on https://lists.wikimedia.org/mailman/listinfo/pywikipedia-l and the #pywikibot IRC channel (see https://www.mediawiki.org/wiki/MediaWiki_on_IRC ).

An improvement was made to the script weblinkchcecker.py on an old branch of Pywikibot (in a separate repository called 'compat'), introducing a configuration variable weblink_dead_days. This improvement needs to be ported to the master branch in the new repository ('core').