Bump github.com/go-openapi/swag from 0.19.15 to 0.20.0 (#634)

Bumps [github.com/go-openapi/swag](https://github.com/go-openapi/swag) from 0.19.15 to 0.20.0.
- [Release notes](https://github.com/go-openapi/swag/releases)
- [Commits](https://github.com/go-openapi/swag/compare/v0.19.15...v0.20.0

)

---
updated-dependencies:
- dependency-name: github.com/go-openapi/swag
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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