Helm3 --dry-run exposes secrets

[JoeTravisKiva]

I'm not sure if this is something that you'd want to address, but helm 3 --dry-run option now displays secrets in cleartext. Since this plugin operates as a wrapper, I was curious about the willingness/capability to mask the secrets values at the wrapper level.

I really like how easy to use the secrets plugin is, but with helm 3 exposing secrets like that, I'm not sure that we can use the plugin.

See: helm/helm#7275 for helm 3 discussion.