message: Add a note to discourage the use of -Zminimal-versions.
diff: @@ -44,6 +44,12 @@ generated if dev-dependencies are skipped.
  * Original Issue: [#4100](https://github.com/rust-lang/cargo/issues/4100)
  * Tracking Issue: [#5657](https://github.com/rust-lang/cargo/issues/5657)
  +> Note: It is not recommended to use this feature. Because it enforces minimal
  +> versions for all transitive dependencies, its usefulness is limited since
  +> not all external dependencies declare proper lower version bounds. It is
  +> intended that it will be changed in the future to only enforce minimal
  +> versions for direct dependencies.
  +
  When a `Cargo.lock` file is generated, the `-Z minimal-versions` flag will
  resolve the dependencies to the minimum semver version that will satisfy the
  requirements (instead of the greatest version).
  