🐸 v0.4.0

Update multi-speaker training API.
VCTK recipes for all the TTS models.
Documentation for multi-speaker training.
Pre-trained Ukrainian GlowTTS model from 👑 https://github.com/robinhad/ukrainian-tts
Pre-trained FastPitch VCTK model
Dataset downloaders for LJSpeech and VCTK under TTS.utils.downloaders
Documentation reformatting.
Trainer V2 and compact. updates in model implementations.

This update makes the Trainer V2 responsible for only the training of a model. The rest is excluded from the trainer and they need to be done either in the model or before calling the trainer.

Try out new models

tts --model_name tts_models/en/vctk/fast_pitch --text "This is my sample text to voice." --speaker_idx VCTK_p229

Pre-trained Ukrainian GlowTTS model from 👑 https://github.com/robinhad/ukrainian-tts

tts --model_name tts_models/uk/mai/glow-tts --text "Це зразок тексту, щоб спробувати нашу модель."