What does "move it into a 'librtd/' subdirectory" mean?
I'm getting the incorrect package structure warning. Its well written, but there is an ambiguous phrase. My directory structure looks like this:

```
.
├── README.md
├── librtd
│   ├── __init__.py
│   ├── cli.nim
│   ├── cli_wrapper.py
│   └── librtd.nim
├── librtd.nimble
├── setup.py
├── test.fasta
└── tests
    ├── config.nims
    ├── tests.cpython-37m-darwin.so
    └── tests.nim
```

The entire directory for the project (tests and all) is entitled `librtd`. Thus, the warning message could mean:

1. Move it into a subdirectory of `librtd/librtd` like `librtd/librtd/cli/cli.nim`.
2. Move it into the subdirectory `librtd/librtd`.
3. Move it into `librtd/` (same level as `librtd.nimble`).

Which is it?