docs: add rsfarias as a contributor

[allcontributors[bot]]

Adds @rsfarias as a contributor for code.

This was requested by jonyw4 in this comment

[github-actions[bot]]

:tada: This PR is included in version 2.1.0 :tada:

The release is available on:

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

Your semantic-release bot :package::rocket: