helm 3 support

Hi

This tool so promising to convert helm charts to regular Kubernetes native yaml files without using helm in some cases. I tried to use this tool today but getting below error. is this works for helm 3?

helm convert --destination mongodb --name mongodb stable/mongodb
Error: Couldn't load repositories file (/Users/skotaru/.helm/repository/repositories.yaml).
You might need to run `helm init` (or `helm init --client-only` if tiller is already installed)