fondberg/spotcast v2.6.0

Add websockets, async and pin zero-conf to previous version

on GitHub

This release is a rewrite to async and could come with some bugs. If you fins any, please report on Github.
It also pins the zero-conf version to the previous which fixes the playback issue in HA >= 1.0.4.
It also adds a web socket api to fetch daily mixes playlists. Please reach out if you plan to use it (meant for spotify-card but it is nice if more projects use it)