TODO: Adjust the following lines from README.md

swh-loader-npm

Software Heritage loader to ingest [`npm`](https://www.npmjs.com/) packages into the archive.

# What does the loader do?

The npm loader visits and loads a npm package [1].

Each visit will result in:

• 1 snapshot (which targets n revisions ; 1 per package release version)
• 1 revision (which targets 1 directory ; the package release version uncompressed)

[1] https://docs.npmjs.com/about-packages-and-modules

## First visit

Given a npm package (origin), the loader, for the first visit:

• retrieves information for the given package (notably released versions) ...