[Java] confusion regarding master and 3.0.0

[SergioArrighi]

Description

I am using the maven plugin to build from a swagger json spec.
So my current issue is that in the model I get the "Allof" classes generated. I get why it is done, but since my model has always a single type I was to get rid of those. Thus I am trying to deploy a feature to skip when $ref has only one element.

Is master branch behind 3.0.0? I can build with 3.0.52 but I can't with master and version is 2.x.x, so which one is more recent?

Swagger-codegen version

Swagger declaration file content or url

Command line used for generation

Steps to reproduce

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