Follows this example: https://golang.org/cl/325581.

Fixes https://github.com/golang/vscode-go/issues/2168

Change-Id: I468d169662eb2cd023b19046a519bb92db3f7c41
GitHub-Last-Rev: 9ec545b9aabc7714302f5c340d5f595738e2cb17
GitHub-Pull-Request: golang/vscode-go#2174
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/399077


Run-TryBot: Suzy Mueller <suzmue@golang.org>
Reviewed-by: Suzy Mueller <suzmue@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Polina Sokolova <polina@google.com>