Updated Protobuf dependency.
Updated Protobuf dependency.

Included fix for nullable structs in collection.

ngs-doo/revenj,ngs-doo/revenj,ngs-doo/revenj,tferega/revenj,ngs-doo/revenj,ngs-doo/revenj,tferega/revenj,tferega/revenj,tferega/revenj