Version 1

This is the release of service-protocol compatible with Restate 1.0

The versioning scheme was modified, and the version number starts again from v1. The version information is now also propagated differently between SDKs and runtime, please check the new paragraphs in the spec:

• https://github.com/restatedev/service-protocol/blob/v1/service-invocation-protocol.md#content-type-and-protocol-version
• https://github.com/restatedev/service-protocol/blob/v1/service-invocation-protocol.md#endpoint-discovery

We now publish on BSR as well: https://buf.build/restatedev/service-protocol/docs