Add Cargo.lock

[minijackson]

Hello and thanks for the awesome project!

I'm trying to package cargo-inspect for Nix, and because it is a package manager that needs reproducible builds, I can't add the project until there is a Cargo.lock file.

As the cargo guide puts it:

If you’re building a non-end product, such as a rust library that other rust packages will depend on, put Cargo.lock in your .gitignore. If you’re building an end product, which are executable
like command-line tool or an application, or a system library with crate-type of staticlib or cdylib, check Cargo.lock into git. If you're curious about why that is, see "Why do binaries have Cargo.lock in version control, but not libraries?" in the
FAQ.

Thanks again!

[mre]

A whoops, no idea how that slipped into the .gitignore. Thanks for fixing.