Auto-detect closest ingest server

Thanks for the awesome project! It looks like the ingest server is based in [Amsterdam](https://github.com/317070/python-twitch-stream/blob/83b4c2a27ee368fc3316b59ab1d25fcf0b0bcda6/twitchstream/outputvideo.py#L163) - OBS has an option to auto-detect the closest one from [here](https://ingest.twitch.tv/api/v2/ingests). Would be great to do this here as well!
