Added a repository field to the Metadata struct (fixes #77)

[Michael-F-Bryan]

Choose one: this is a 🙋 feature

This resolves #77 by adding a repository field to the Metadata struct and a corresponding "Repository: ..." line to the message that gets printed

Checklist

• [x] tests pass
• [x] tests and/or benchmarks are included
• [x] documentation is changed or added

Context

See #77.

Semver Changes

This is a breaking change because it adds a field to Metadata, which doesn't have the #[non_exhaustive] attribute.

[Michael-F-Bryan]

Note that this repo no longer satisfies its own MSRV because the Cargo.lock file isn't committed and a number of dependencies use newer Rust features.

Compiler errors with Rust 1.36.0

$ cargo +1.36.0 test
  ...
error: cannot find macro `matches!` in this scope
   --> /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/rustc-demangle-0.1.21/src/v0.rs:700:20
    |
700 |                 if matches!((quote, c), ('\'', '"') | ('"', '\'')) {
    |                    ^^^^^^^

error: aborting due to previous error

error: Could not compile `rustc-demangle`.
warning: build failed, waiting for other jobs to finish...
error[E0658]: naming constants with `_` is unstable
  --> /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/memchr-2.4.1/src/memmem/prefilter/fallback.rs:37:1
   |
37 | const _: PrefilterFnTy = find;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/54912

error[E0658]: naming constants with `_` is unstable
 --> /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/memchr-2.4.1/src/memmem/prefilter/x86/sse.rs:9:1
  |
9 | const _: PrefilterFnTy = find;
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: for more information, see https://github.com/rust-lang/rust/issues/54912

error[E0658]: non exhaustive is an experimental feature
   --> /home/michael/.cargo/registry/src/github.com-1ecc6299db9ec823/memchr-2.4.1/src/memmem/prefilter/mod.rs:152:1
    |
152 | #[non_exhaustive]
    | ^^^^^^^^^^^^^^^^^
    |
    = note: for more information, see https://github.com/rust-lang/rust/issues/44109

error: aborting due to 3 previous errors

I've created #79 to track this.