* The following libraries are now required:
** psr/log
This library provides the interfaces set by the PSR-3 standard (http://www.php-fig.org/psr/psr-3/)
- which are used by MediaWiki interally by the MWLogger class.
+ which are used by MediaWiki internally via the MWLoggerFactory class.
See the structured logging RfC (https://www.mediawiki.org/wiki/Requests_for_comment/Structured_logging)
for more background information.
** cssjanus/cssjanus