Need help in generating swagger 3.0 specification

I have a JAVA project that is Swagger-annotated with Swagger Spec 2.0 annotations. I have been using swagger-maven-plugin to generate the Swagger specification (https://github.com/kongchen/swagger-maven-plugin).

I want to upgrade to Swagger Spec 3.0. I will change the annotations manually in the project. But I need help how to generate the specification in 3.0. As the swagger-maven-plugin supports only upto 2.0. 

any help would be really appreciated.