Always resume downloads (#674)

* Always resume downloads

* format

---------

Co-authored-by: Awni Hannun <awni@apple.com>

llms/mlx_lm/utils.py

@@ -86,6 +86,7 @@ def get_model_path(path_or_hf_repo: str, revision: Optional[str] = None) -> Path
                     "*.tiktoken",
                     "*.txt",
                 ],
+                resume_download=True,
             )
         )
     return model_path