Add a note about why Clippy doesn't do this?

[tombh]

Thanks for this crate, it worked first time, removing 9 deps! ❤️

I chose yours over the others (machete, udeps, etc) because of the comparison section in the README. I wonder if it might also be useful to add a few lines explaining why such a crate is necessary? I was surprised that such functionality isn't already supported in Clippy for example. There are issues like these; rust-lang/rust#57274, rust-lang/rust-clippy#4341, that track this.

Seeing at a glance both the other available projects and the reasons why these projects exist would be a nice way of helping to make a quick and informed decision to install this particular project (which also gave me a six-pack and restored my 20/20 vision).

[Boshen]

These projects were created one after another with years apart, each improving the existing one when cargo added more features. cargo workspaces is a fairly "new" feature 😅

Clippy doesn't have project-wide analysis I think, you need to go through some hoops to get the workspace data you need ...

[tombh]

Thanks for the context and update 😊