test.bash: update to go1.10.4 and go1.11.1
test.bash: update to go1.10.4 and go1.11.1

Change-Id: Ib593768cb30fab41ff93e90cc12401e3b7126e6c
Reviewed-on: https://go-review.googlesource.com/c/142457
Reviewed-by: Damien Neil <7e091e9a80da888fcd7836fd3c6b7b85f4677c12@google.com>

protocolbuffers/protobuf-go,protocolbuffers/protobuf-go