0.9.0 release updates (hashicorp#439)

Changelog, chart metadata, and image versions

Update to 0.8.0 (hashicorp#405)

* Update to 0.8.0

* Fix changelog formatting

Update to 0.7.0 (hashicorp#374)

Update to 0.7.0

Update to v0.6.0 (hashicorp#320)

Update to 0.5.0 (hashicorp#253)

* Update to 0.5.0

* Add changelog for k8s service discovery

Update to 0.4.0 (hashicorp#211)

Update to v0.3.3 (hashicorp#178)

* Update to v0.3.3

* Reorder changelog

Update to 0.3.2 (hashicorp#166)

Update to 0.3.1 (hashicorp#162)

Update to 0.3.0 (hashicorp#154)