3.0.3 changes the VRLO API so that all methods default to a no-op instead of raising an exception. This allows you to only implement a few of the methods instead of implementing every single one.
There are multiple small bugfixes as well for minor issues.
Finally, 3.0.3 adds the ability to import/export Vulntypes using XML files. There is a new folder (/vulntypeExamples) with some XML files of Vulntypes we use internally for Salesforce platform apps and infra security reviews. These can be imported via the admin UI after the initial install/seed.
My next priority is issue #3 - allowing import of vulns to tests from ZAP XML files. Look for that and some more VRLO functionality updates coming soon. These will likely make up 3.1 in the next month or so. Any future 3.0.x releases will be bugfixes or very minor improvements.