`Mod.user` is optional apparently.

Update the readme.

Minor tweaks to method doc strings.

Add license/readme to pyproject.toml

Relax python version requirements.

Fix downloading to actually download all the data...

Download files in chunks to conserve memory, rather than all at once .

Specify `mod_version` attribute of `File` as Optional.

Rename `get_updated_mods` to `get_mod_updates` to better reflect return type.

Fix request limiter.

Refactor function names to be more consistent/explicit.

Update tests.

Tweak return type for `get_md5_search`.

Replace `get_files` with `get_files_and_updates`.

Add `get_content_preview` method + various minor refactoring.