Feature request: OpenAPI 3.0 support in project and export/import

[AleksCerberus]

Hello! Please add support for OpenAPI 3.0 in some future release Reason: Swagger 2.0 doesn't support such attributes as "anyOf" , "oneOf", "not" in schemas.

May be it will be useful to look at project "Convert Swagger 2.0 definitions to OpenAPI 3.0 and resolve/validate/lint" https://github.com/Mermade/oas-kit

Also I would like to say a thank you for your project and great work!

[kilitary]

coders mostly using postman, it have its own property sheet