message: Dependency to docker and docker-compose added
diff: Rustwide internally uses `rustops/crates-build-env` as the build environment for the crate. If you want to add a system package for crates to link to, this is place you're looking for.
  +## Preconditions
  +
  +Docker and docker-compose must be installed. For example, on Debian or Ubuntu:
  +
  +```sh
  +apt-get install docker.io docker-compose
  +```
  +
  ## Getting started
  First, clone the crates-build-env and the docs.rs repos:
  