For some reason we were renaming cloudevents.proto as ProtoSchema.proto, which breaks compatibility with anyone using the original file.
Renaming the reflection class is a breaking change, so I've added an obsolete compatibility class to keep compatibility.
Also updated to Google.Protobuf 3.22.0 (of the general protobuf 22.0 release; protobuf versioning is complex).
Fixes#256
Signed-off-by: Jon Skeet <jonskeet@google.com>
Jon Skeet