add --recurse-submodules

from strob#257

README.md

@@ -24,7 +24,7 @@ curl -F "[email protected]" -F "[email protected]" "http://localhost:8765/tra
 If you've downloaded the source code you can also run the aligner as a command line program:
 
 ```bash
-git clone https://github.com/lowerquality/gentle.git
+git clone --recurse-submodules https://github.com/lowerquality/gentle.git
 cd gentle
 ./install.sh
 python3 align.py audio.mp3 words.txt