* Add update support for calendars and implement in local calendar
* Fix supported feature for update calendar
* Increase test coverage for websocket error cases
* Improve test coverage for update failure cases
* Improve test coverage by sharing code between update and create
* Update homeassistant/components/calendar/__init__.py
Co-authored-by: Martin Hjelmare <marhje52@gmail.com>
Co-authored-by: Martin Hjelmare <marhje52@gmail.com>
