huggingface-hub version conflict
`transformers` requires `huggingface-hub==0.0.12` in `setup.py` in the `master` branch. 

`huggingface-hub` has just released version `0.0.15`. 

Other projects that use `huggingface-hub`, such as `https://github.com/UKPLab/sentence-transformers`, are happy with the latest version of `huggingface-hub`.

Depending upon the order of installation, a version conflict may result.  Here's a sample message from our project, `kgtk`, which requires both `transformers` and `sentence-transformers`:

```pkg_resources.ContextualVersionConflict: (huggingface-hub 0.0.15 (/opt/anaconda3/envs/kgtk-env/lib/python3.8/site-packages/huggingface_hub-0.0.15-py3.8.egg), Requirement.parse('huggingface-hub==0.0.12'), {'transformers'})```

This is discussed in #12961 <|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/master/CONTRIBUTING.md) are likely to be ignored.