remove extraneous token arg from clone_forks()

teach_auto/clone_forks.py

@@ -23,7 +23,7 @@ def clone_fork(url: str, out_path: Path, commit: str):
 @click.command()
 @click.argument("out_dir", type=click.Path(file_okay=False, exists=False))
 @click.argument("forks", type=click.File(mode="r"), default=sys.stdin)
-def clone_forks(out_dir, forks, token):
+def clone_forks(out_dir, forks):
     """Clone all forks from input JSON into target directory. The input json should be produced by collect-forks."""
 
     forks = json.load(forks)