v0.20.0-M3

What’s Changed

• Add a way to add (encoded) examples for streaming bodies (#1702) @adamw
• Allow customisation of the generated OpenAPI model when exposing swagger ui (#1700) @adamw
• Modify the index.html for Swagger UI so that it references the docs yaml directly (#1697) @adamw
• Update magnolia to softwaremill's version (#1696) @adamw

Dependency updates

• Update simpleclient_common to 0.13.0 (#1682) @scala-steward
• Update scala-library, scala-reflect to 2.13.7 (#1571) @scala-steward
• Update shared:akka, shared:core, shared:fs2, ... to 1.3.0 (#1691) @scala-steward