The library should return the failed lints

[marcoieni]

Describe your use case

I want to use cargo-semver-checks as a library.
Right now the library only tells if the check was successful or not.
I want to know which checks failed and where.

Describe the solution you'd like

Add failed checks to this struct:

cargo-semver-checks/src/lib.rs

Line 418 in 789f130

success: bool,

Alternatives, if applicable

No response

Additional Context

I started working on this.