Update status serialization for Zipkin (was: Remove mention of gRPC status codes) (#1186)
Update status serialization for Zipkin (was: Remove mention of gRPC status codes) (#1186)

Co-authored-by: Christian Neumüller <f80c045e0b29a8a0d8cfc19e571e9d9523c3f1c5@neumueller.me>
open-telemetry/opentelemetry-specification,open-telemetry/opentelemetry-specification