Publish a crate

[srounce]

It'd be helpful to have this uploaded to crates.io if only for the automatic documentation generation facilities. It was also the first place I looked for a package that did exactly what Catibo does and it was only looking at the dependencies of another project did I discover this awesome work. I'm proposing a GitHub actions workflow that pushes a crate when a valid semver version is tagged. Happy to set this up, though you'll obviously have to set your crates.io key in the repo secrets.