Update app.py

app.py

@@ -53,7 +53,7 @@ class BatchStreamer(TextIteratorStreamer):
 
         # Add the new token to the cache and decodes the entire thing.
         for c, v in zip(self.token_cache, value):
-            c.append(v)
+            c += v
 
         paragraphs = [tokenizer.decode(c, **self.decode_kwargs).strip() for c in self.token_cache]
         text = '\n'.join(paragraphs)