Need to support yaml file to update config values

[edwardstudy]

As helm install/upgrade command, -f option could specify values in a YAML file. I think it a good feature to this plugin.

[burdiyan]

Honestly I'm not using this plugin much anymore, and never needed this feature. For sure would accept a PR if someone implements it.

[edwardstudy]

Hi, @burdiyan

We updated many features to this plugin, such as values file and TLS support. Maybe we could open PR.

[burdiyan]

@edwardstudy Sure, feel free to open a PR an I will merge it.