Update README.md to match the latest code

[Leask]

Fix reference for toMagnetURI and toTorrentFile.

What is the purpose of this pull request? (put an "X" next to item)

[X] Documentation update [ ] Bug fix [ ] New feature [ ] Other, please explain:

What changes did you make? (Give an overview)

• Update README.md to match the latest code
• Fix reference for toMagnetURI and toTorrentFile.

Which issue (if any) does this pull request address?

Is there anything you'd like reviewers to focus on?

[welcome[bot]]

🙌 Thanks for opening this pull request! You're awesome.

[welcome[bot]]

🎉 Congrats on getting your first pull request landed!

[webtorrent-bot]

:tada: This PR is included in version 11.0.13 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: