Add a "Reviewed by Hound" badge (#15767)

README.rst

@@ -1,5 +1,5 @@
-Home Assistant |Build Status| |Coverage Status| |Chat Status|
-=============================================================
+Home Assistant |Build Status| |Coverage Status| |Chat Status| |Reviewed by Hound|
+=================================================================================
 
 Home Assistant is a home automation platform running on Python 3. It is able to track and control all devices at home and offer a platform for automating control.
 
@@ -33,6 +33,8 @@ of a component, check the `Home Assistant help section <https://home-assistant.i
    :target: https://coveralls.io/r/home-assistant/home-assistant?branch=master
 .. |Chat Status| image:: https://img.shields.io/discord/330944238910963714.svg
    :target: https://discord.gg/c5DvZ4e
+.. |Reviewed by Hound| image:: https://img.shields.io/badge/Reviewed_by-Hound-8E64B0.svg
+   :target: https://houndci.com
 .. |screenshot-states| image:: https://raw.github.com/home-assistant/home-assistant/master/docs/screenshots.png
    :target: https://home-assistant.io/demo/
 .. |screenshot-components| image:: https://raw.github.com/home-assistant/home-assistant/dev/docs/screenshot-components.png