https://github.com/riverrun/comeonin/blob/master/UPGRADE_v5.md

Restricted embedding of relationships where applicable (statuses / notifications / accounts rendering).
Added support for :skip_notifications for accounts listing (index.json).
Adjusted tests.

Ability to control the output of account/pleroma/relationship in statuses in order to improve the rendering performance.
See `[:extensions, output_relationships_in_statuses_by_default]` setting and `with_relationships` param.