Fatal error since last update

Hi everobody.

While I was still using WordPress 4.3, I updated Regenerate Thumbnails along with other plugins. The result was a 500 error on the whole site (including the admin panel), I found out that the guilty plugin is Regenerate Thumbnails.

Before and after upgrading WordPress to 4.4.1, if I try to reactivate the plugin, the admin panel tells me it failed to because of this fatal error:

Parse error: syntax error, unexpected ‘[‘ in /home/pierrel/Daoust.Media/wp-content/plugins/regenerate-thumbnails-advanced/regenerate-thumbnails-advanced.php on line 336

I looked in the file around this line, nothing seems wrong, but I’m still a novice with PHP so there must ne something I don’t see. Thanks for looking at it! 🙂

https://wordpress.org/plugins/regenerate-thumbnails-advanced/