My first Rust crate - Identicons

Hi everybody, I'm preparing to publish my first rust crate to the registry and I wanted your suggestions and feedbaks. This crate is a port of a Javascript crate with some tweaks, it can generate avatar images like the ones GitHub creates for new accounts. I would like to have feedback especially on the documentation, that you can see by cloning the repository and running cargo doc --open.

Thanks in advance!