Eliminate yarn version printing
Apparently yarn requires a TTY to print the version.  (No idea why.)
This wasn't an essential change, so I'll just nix it for now.
@@ -124,7 +124,6 @@ func LumiProgramTest(t *testing.T, opts LumiProgramTestOptions) {
_, err = fmt.Fprintf(opts.Stdout, "lumi: %v\n", opts.LumiBin)
contract.IgnoreError(err)
_, err = fmt.Fprintf(opts.Stdout, "yarn: %v\n", opts.YarnBin)
- runCmd(t, []string{opts.YarnBin, "version"}, dir, opts)
contract.IgnoreError(err)
// Now copy the source project, excluding the .lumi directory.
