pip install adversarialnlp doesn't work

Hi @thomwolf ,

Thanks for this, just wanted to point out that pip installation doesn't find adversarialnlp
```
Could not find a version that satisfies the requirement adversarialnlp (from versions: )
No matching distribution found for adversarialnlp
```

Reproduce the reported `pip install adversarialnlp` failure and inspect the repository's packaging entry points; no specific file or test is named in the issue. Done means the package can be found and installed successfully through pip.

Written by the indexing model from the issue text.