BUG FIXES:
* Fix kubernetes auth method list roles method. [GH-466](https://github.com/hvac/hvac/pull/466)
* Enable consul secrets engine. [GH-460](https://github.com/hvac/hvac/pull/460)
* Enable database secrets engine. [GH-455](https://github.com/hvac/hvac/pull/455)
* Many fixes for the database secrets engine. [GH-457](https://github.com/hvac/hvac/pull/457)
IMPROVEMENTS:
* The `enable_auth_method()`, `tune_auth_method()`, `enable_secrets_engine()`, `tune_mount_configuration()` system backend method now take arbitrary `**kwargs` parameters to provide greater support for variations in accepted parameters in the underlying Vault plugins.
* Azure auth params, add `num_uses`, change `bound_location` -> `bound_locations` and `bound_resource_group_names` -> `bound_resource_groups`. [GH-452](https://github.com/hvac/hvac/pull/452)
MISCELLANEOUS:
* The hvac project now has gitter chat enabled. Feel free to check it out for any online discussions related to this module at: [gitter.im/hvac/community](https://gitter.im/hvac/community))! [GH-465](https://github.com/hvac/hvac/pull/465)
* Added Vault agent socket listener usage example under the "advanced usage" documentation section at: [hvac.readthedocs.io](https://hvac.readthedocs.io/en/stable/advanced_usage.html#vault-agent-unix-socket-listener) [GH-468](https://github.com/hvac/hvac/issues/468)
Thanks to denisvll, Dudesons, and drewmullen for their lovely contributions.