- Update documentation
- -side option is deprecated with wikidata
- new feature for -nocache: ignoring several lang codes retrieved from cache

https://mediawiki.org/wiki/Special:Code/pywikipedia/11741
nocache must be a list or True

https://mediawiki.org/wiki/Special:Code/pywikipedia/11742
strip trailing whitespaces

https://mediawiki.org/wiki/Special:Code/pywikipedia/11743