Bugfix/openapi generation

[mcNisse]

Pull Request Description

Please include a summary of the change and which issue is fixed or added. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #2

Checklist

• [x] Changes are limited to a single goal (avoid scope creep)
• [x] I confirm that I have read any Contribution and Development guidelines (CONTRIBUTING and DEVELOPMENT) and are following their suggestions.
• [x] I confirm that I wrote and/or have the right to submit the contents of my Pull Request, by agreeing to the Developer Certificate of Origin, (adding a 'sign-off' to my commits).

[marcodeluca1]

Tack för korrigering av API.

Element blir obsolet med användningen av nyckelordet $ref .