Update app.py

app.py

@@ -14,6 +14,9 @@ def download_assets():
     os.system("wget https://raw.githubusercontent.com/NTT123/vietTTS/master/assets/infore/lexicon.txt")
 
 def text_to_speech(text):
+    # prevent too long text
+    if len(text) > 100:
+        text = text[:100]
     text = nat_normalize_text(text)
     mel = text2mel(
         text,