Check `description` field in `Cargo.toml` for typos

[Ryan Lopopolo]

Is your feature request related to a particular use-case?

I published a crate to crates.io with a typo in the description field in Cargo.toml.

Describe the solution you'd like to implement/see implemented

Perform spellchecking on the description field in Cargo.toml.

Describe alternatives you've considered

code review, post-publish review.

Additional context

[Bernhard Schuster]

There is only a small chunk of code missing to make this functional, adding another match arm to handle ChevkEntity::ManifestDesctiption in

cargo-spellcheck/src/traverse/mod.rs

Line 555 in 748b4f0

 warn!("Did not impl handling of {:?} type files", other); 

I'd be very happy to review a PR for this 😊

[Ryan Lopopolo]

Thanks for the pointer @drahnr.

I put up a WIP PR here:

• #235