Update examples

The current example(also them on your github repo) are outdated. The example uses client.unaryCall but currently, what is being used is makeUnaryRequest. Could you provide us example to that please? Thanks! 

https://stackoverflow.com/questions/64530776/how-do-you-generate-typings-for-protobuf-files-for-use-with-grpc/65329444?noredirect=1#comment118910626_65329444