New features
* Add plot_dist ([592](https://github.com/arviz-devs/arviz/pull/592))
* New rhat and ess ([623](https://github.com/arviz-devs/arviz/pull/623))
* Add plot_hpd ([611](https://github.com/arviz-devs/arviz/pull/611))
* Add plot_rank ([625](https://github.com/arviz-devs/arviz/pull/625))
Deprecation
* Remove load_data and save_data ([625](https://github.com/arviz-devs/arviz/pull/625))