In #3454, I tried to update certificate-transparency-go, but that pulled in a bunch of extra package updates, making for a complicated PR. This PR breaks out one of the packages that needed update, to allow us to bring things up to date in a simpler, more piecemeal fashion.
$ go test github.com/golang/protobuf/...
ok github.com/golang/protobuf/descriptor 0.004s
ok github.com/golang/protobuf/jsonpb 0.012s
? github.com/golang/protobuf/jsonpb/jsonpb_test_proto [no test
files]
ok github.com/golang/protobuf/proto 0.062s
? github.com/golang/protobuf/proto/proto3_proto [no test files]
? github.com/golang/protobuf/protoc-gen-go [no test files]
? github.com/golang/protobuf/protoc-gen-go/descriptor [no test
files]
ok github.com/golang/protobuf/protoc-gen-go/generator 0.002s
? github.com/golang/protobuf/protoc-gen-go/grpc [no test files]
? github.com/golang/protobuf/protoc-gen-go/plugin [no test files]
ok github.com/golang/protobuf/ptypes 0.014s
? github.com/golang/protobuf/ptypes/any [no test files]
? github.com/golang/protobuf/ptypes/duration [no test files]
? github.com/golang/protobuf/ptypes/empty [no test files]
? github.com/golang/protobuf/ptypes/struct [no test files]
? github.com/golang/protobuf/ptypes/timestamp [no test files]
? github.com/golang/protobuf/ptypes/wrappers [no test files]
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