Update app.py

fix for tts 0.17.2

app.py

@@ -1,6 +1,10 @@
 import gradio as gr
+import os 
 from TTS.api import TTS
 
+# By using this model you agree to COQUI TOS, will double check on GUI
+os.environ["COQUI_TOS_AGREED"] = "1" 
+
 tts = TTS("tts_models/multilingual/multi-dataset/xtts_v1")
 tts.to("cuda")