OAS 3.1 support

Hi chichepo 

I have the same problem as you - I pressed the "upgrade" button and some minor changes to description attributes was made automatically. As I wrote earlier not even the "openapi" definition was changed to 3.1.0 which would seem kind of strange since I would assume this would be essential for the system to know that it is a 3.1.0 specification..?

I also get the "No content due to Errors..." message 😞

Not sure if it is supported or not - I only stumbled across the possibility to upgrade...