added blank line at the bottom of cache.py

Author: edwaddle

modules/cache.py

@@ -164,4 +164,5 @@ def write_cache(self):
     def get_video_id(url) -> str:
         parsed_url = urlparse(url)
         video_id = parse_qs(parsed_url.query)["v"][0]
-        return video_id
+        return video_id
+