message: Minor book additions for migration from libtest
diff: @@ -37,6 +37,13 @@ name = "example"
  harness = false
  ```
  +We also need to add Criterion.rs to the `dev-dependencies` section of `Cargo.toml`:
  +
  +```toml
  +[dev-dependencies]
  +criterion = "0.1.2"
  +```
  +
  The next step is to update the imports:
  ```rust
  @@ -59,8 +66,8 @@ Finally, we need to invoke some macros to generate a main function, since we
  no longer have libtest to provide one:
  ```rust
  -criterion_group(benches, bench_fib);
  -criterion_main(benches);
  +criterion_group!(benches, bench_fib);
  +criterion_main!(benches);
  ```
  And that's it! The complete migrated benchmark code is below:
  