message: Add note about docker-compose PostgreSQL URL
diff: @@ -86,13 +86,16 @@ cargo test
  ```
  Some tests require access to the database. To run them, set the
  -`CRATESFYI_DATABASE_URL` to the url of a PostgreSQL database. You don't have to
  -run the migrations on it or ensure it's empty, as all the tests use temporary
  -tables to prevent conflicts with each other or existing data. See the [wiki
  -page on developing outside docker-compose][wiki-no-compose] for more
  -information on how to setup this environment.
  +`CRATESFYI_DATABASE_URL` to the url of a PostgreSQL database. If you are using
  +the `docker-compose` environment to run tests against, see the
  +[Docker-Compose][docker-compose-section] section for the default PostgreSQL URL.
  +You don't have to run the migrations on it or ensure it's empty, as all the
  +tests use temporary tables to prevent conflicts with each other or existing
  +data. See the [wiki page on developing outside docker-compose][wiki-no-compose]
  +for more information on how to setup this environment.
  [wiki-no-compose]: https://github.com/rust-lang/docs.rs/wiki/Developing-without-docker-compose
  +[docker-compose-section]: #Docker-Compose
  ### Docker-Compose
  