Add "Geospatial" category to `Cargo.toml`

[frewsxcv]

https://github.com/rust-lang/crates.io/commit/9b65b4c004c503cf234c503e82d8575ba42c45e2

https://doc.rust-lang.org/cargo/reference/manifest.html#the-categories-field

[pka]

Added category but got: warning: the following are not valid category slugs and were ignored: Geospatial. Please see https://crates.io/category_slugs for the list of all category slugs.

Is science::geo the new slug?

[frewsxcv]

Seems like it, yeah https://github.com/HydroniumLabs/h3oh3o/commit/9e584fa5a1aebbad78c76fe828d9085ddf06380e