drop custom SSML support (regular customization like pitch, rate, etc still available); n/a for us because we already dropped it
Important changes:
fix unbound local variable error if we didn't receive anything from websocket
fix bugs for Windows related to asyncio
fix exception for when Microsoft sends "SessionEnd" metadata type (new metadata type that Microsoft doesn't send all the time, but not handling it properly causes us to be less reliable and return no MP3)
Misc changes:
Important changes: