sedre

Trying to use this crate always fails to compile and suggests that folks run cargo install serde instead.

I put this in place because serde is a part of Rust's critical library infrastructure now and should be protected from typo-squatting.

Note that if you did run cargo install sedre, then since it results in a compilation error, there is no need to uninstall the sedre crate first.

This is based on https://github.com/BurntSushi/rg-cratesio-typosquat, which provides some more detailed reasoning.