Add more keys to filter

- `heatmap`: is a huge list of tiny "chapters" used to display popularity of sections of the video
- `requested_subtitles`: also has a URL that expires

tubesync/sync/utils.py

@@ -282,13 +282,19 @@ def filter_response(arg_dict, copy_arg=False):
             )
         )
 
-    for key in frozenset(('subtitles', 'automatic_captions',)):
+    for key in frozenset(('subtitles', 'requested_subtitles', 'automatic_captions',)):
         if key in response_dict.keys():
             key_dict = response_dict[key]
             for lang_code in key_dict:
                 _drop_url_keys(key_dict, lang_code, drop_subtitles_url)
     # end of subtitles cleanup }}}
  
+    # beginning of heatmap cleanup {{{
+    for key in frozenset(('heatmap',)):
+        if key in response_dict.keys():
+            del response_dict[key]
+    # end of heatmap cleanup }}}
+
     return response_dict