Update app.py

app.py

@@ -16,7 +16,7 @@ def get_subtitle(url, lang='en'):
         'subtitleslangs': [lang],
         'skip_download': True,
     }
-    info_dict = ydl.extract_info(url, download=True)
+    info_dict = yt_dlp.extract_info(url, download=True)
     video_id = info_dict.get("id", None)
     if video_id is None:
         return None