Update app.py

app.py

@@ -13,7 +13,7 @@ os.system("git clone https://github.com/neonbjb/tortoise-tts.git")
 sys.path.append("tortoise-tts")
 
 # entmax could not be installed at same time as torch
-ubprocess.check_call([sys.executable, "-m", "pip", "install", "entmax"])
+subprocess.check_call([sys.executable, "-m", "pip", "install", "entmax"])
 
 from api import TextToSpeech
 from utils.audio import load_audio, get_voices