Update README.md

README.md

@@ -101,7 +101,7 @@ install DataSpeech and Parler-TTS sequentially:
 ```sh
 git clone git@github.com:huggingface/dataspeech.git && cd dataspeech && pip install -r requirements.txt
 cd ..
-git clone https://github.com/huggingface/parler-tts.git && cd parler-tts && pip install -e .[train] 
+git clone https://github.com/huggingface/parler-tts.git && cd parler-tts && pip install -e ."[train]"
 cd ..
 ```