Add option to skip API key

bin/gitlab-cloner

@@ -30,7 +30,8 @@ def main():
     """
     parser = argparse.ArgumentParser()
     parser.add_argument("url", help="The Gitlab URL, including https etc")
-    parser.add_argument("token", help="The Gitlab Personal Access Token")
+    parser.add_argument("token", nargs="?", default="",
+                        help="The Gitlab Personal Access Token")
     parser.add_argument("-d", "--destination", default=os.getcwd(),
                         help="The destination directory.")
     args = parser.parse_args()