Update app.py

app.py

@@ -63,7 +63,7 @@ def inference(language,speed,voice,video ):
         tts = gTTS(translation.text, lang= "hi")
         tts.save('input_audio.wav')
     os.system('mv ./Wav2Lip/* .')
-    os.system('pip install -r requirements.txt')
+    os.system('pip3 install -r requirements.txt')
     os.system("python inference.py --checkpoint_path ./wav2lip_gan.pth --video {} --input_audio.wav".format(video))
     return "./results/result_voice.mp4"