Anthemav

What's Changed
* Fix error parsing data for x40 model
* Add audio listening mode for x40 model

**Full Changelog**: https://github.com/nugget/python-anthemav/compare/v1.3.0...v1.3.1

What's Changed
* Add support for x40 series

* Fix async and blocking issues with Home Assistant

* Avoid refreshing data too often when receiver is starting

* Add initialised function to better support HA UI setup

**Full Changelog**: https://github.com/nugget/python-anthemav/compare/v1.2.0...v1.3.0

* Change auto_reconnect behavior during initial connection to allow config flow integration with home assistant
* Fix bug with power state on not reported
* Fix bug with Mute state not reported
* Overall code improvement
* Minimum Python 3.6 required (previously 3.4)

Thanks achatham !

* `async` is a reserved word in Python 3.7, so we have to make a minor adjustment to avoid a syntax error.
* Also did some housekeeping for the pypi release process and how README is handled.