add a missing comma

archivebox/extractors/singlefile.py

@@ -70,7 +70,7 @@ def save_singlefile(link: Link, out_dir: Optional[Path]=None, timeout: int=TIMEO
 
     cmd = [
         DEPENDENCIES['SINGLEFILE_BINARY']['path'],
-        *deduped_options
+        *deduped_options,
         link.url,
         output,
     ]