v3.0.0: Adds zc156 support, now a drop-in plugin!
This version of USU supports Zen Cart 1.5.5 and later, providing updates for the following GitHub issues:
#2: Simplification of the plugin's logging interface.
#7: Correct canonical-link not being written.
#8: Correct usage of zen_get_info_page
when used during admin processing (zc156+ integration).
#10: USU installer doesn't update zc156+ core files correctly.
#11: Restructure plugin to require no core-file overwrites
Note that the "no-core overwrites" requires that the changes required by previous versions of USU must be removed prior to installing v3.0.0.
See the following link for more information: https://github.com/lat9/usu/blob/master/pages/upgrade_from_v2.md