add attribute for quality to Channels.PublicationChannelWebstream to API
quality of f. e. mp3-stream can differ
some radios offer different qualities of their stream f. e.
98, 128, 160, 320, ... Kbit/s
quality of f. e. mp3-stream can differ
some radios offer different qualities of their stream f. e.
98, 128, 160, 320, ... Kbit/s