Update grpc to 1.26 (#417)
* Upgrade grpc and protobuf versions. * Roolback protobuf version to the one present in Maven. * Remove JDK 8 classifier from grpc-kotlin library reference.
Authored by: Brett Morien 2020-01-22
Committed by: GitHub 2020-01-22
Parent: [cd04b1]
Child: [6994df]