README.md: adding submodule init to README

README.md

@@ -20,10 +20,11 @@ Visit our [website] for audio samples.
 1. Download and extract the [LJ Speech dataset](https://keithito.com/LJ-Speech-Dataset/)
 2. Clone this repo: `git clone https://github.com/NVIDIA/tacotron2.git`
 3. CD into this repo: `cd tacotron2`
-4. Update .wav paths: `sed -i -- 's,DUMMY,ljs_dataset_folder/wavs,g' filelists/*.txt`
+4. Initialize submodule: `git submodule init; git submodule update`
+5. Update .wav paths: `sed -i -- 's,DUMMY,ljs_dataset_folder/wavs,g' filelists/*.txt`
     - Alternatively, set `load_mel_from_disk=True` in `hparams.py` and update mel-spectrogram paths 
-5. Install [PyTorch 1.0]
-6. Install python requirements or build docker image 
+6. Install [PyTorch 1.0]
+7. Install python requirements or build docker image 
     - Install python requirements: `pip install -r requirements.txt`
 
 ## Training