Support for protobuf version 3.15

[plombaer]

Hi,

Apparently protobuf 3.15 support [optional] field. Look helpful for nullable timestamp.
message MyMessage {
google.protobuf.Timestamp date = 1 [optional];
}
I tried it in a .Net gRPC project but it doesn't compile.
Is it foreseen to be supported ?

[JamesNK]

This is a protobuf issue. Please create it here: https://github.com/protocolbuffers/protobuf