Yes, I can confirm, downgrading to version 2.5 did the trick.
Please be kind and opt for one of these options:
1) Restore support to PHP 5.4 and keep it so for 1-2 years.
2) Restore support to PHP 5.4 but show a noticeable admin warning in the backend recommending the switch to PHP 5.6 ASAP becausa as of December 2016 your plugin won’t even activate under PHP 5.5 or lower.
3) Add a visible note in the Description page here in the repo making noticeable that this plugin won’t work with PHP <5.6
This kind of changes may affect lots of people, and given that this plugin is used to BUILD websites, you must be careful and let users know your plans with enough anticipation. 4 months should be enough.
Thank you for reading. Hope you can take all this into consideration ??