Use older version in replacement to avoid go panic when module version already referenced:
panic: unexpected output encountered: go: github.com/sourcegraph/appdash-data@v0.0.0-20151005221446-73f23eafcf67 used for two different module paths (github.com/sourcegraph/appdash-data and sourcegraph.com/sourcegraph/appdash-data) (Did you use -json on go test?)
Fixes https://github.com/pulumi/pulumi-cdk/issues/98
sourcegraph.com/sourcegraph/appdash-data