Support for --strict in helmlint hook

[wheelerlaw]

Describe the solution you'd like
helm supports the --strict option for failing on warnings when linting. It would be nice if the pre-commit hook also supported this. I've tried messing around with it but it looks like the only way to support this is a change in the helmlint.sh file.

Describe alternatives you've considered
Not sure if there are any alternatives, as the helm command is called directly in the script

Additional context
Add any other context or screenshots about the feature request here.