[atlas] swagger spec 2.0

Hi, I can't write to the previous post about swagger, so created the new one. I made some tooling auto conversion from 1.2 to 2.0 and a little bit of hand fixing to current spec. It would be nice if anybody could help with getting 2.0 version up to date. Here is what I have for now: https://app.swaggerhub.com/apis/akme/ripe-atlas_api_reference/v2.4.0