Release 0.9.0

Update for v0.8.1 release

Prepare chart for release

Update versions for a release

Update Chart.yaml version to 0.6.0

Update CHANGELOG.md

Merge pull request hashicorp#82 from hashicorp/release-0.4.0

Update chart version and changelog to 0.4.0 for release

update CHANGELOG

Update CHANGELOG

Update README