v2.8.0

Feature

• Add support for canned_tts (89778e3) Documentation
• Add media_stop command (2bafef8)
• Add previous_value attrib for notifications (2a43ffd)
• Add attributes for bluetooth devices (6cf69fa)

Fix

• Fix bug for null mainArt (5842af1)

Performance

• Convert bluetooth gets to sync (b0907ce)