Welcome ttconv 1.0.0!

Welcome ttconv 1.0.0! Open source subtitle/caption format conversion. Converts SCC/608 to TTML and TTML to SRT, and more… Thanks to David Ronca and Facebook for the support, and Valentin NOËL and Bob Brown for their contributions.
https://github.com/sandflow/ttconv #cea608 #imsc #subtitles #captioning #ttml