There are no database changes in this release but you should update your Stripe webhook API version to 2019-02-19.

A few bugs are fixed.

This release introduces a number of new features, standardises the behaviour of recurring contributions/memberships to match standard CiviCRM functionality and does a major cleanup of the backend code to improve stability and allow for new features.

Please upgrade to 5.0 if you are on ANY older version. Then upgrade directly to 5.2. You do not need to install 5.1 first.