v5.9.0 (🎂 Ordering a Cake)

• Add variable interpolation note (#257) @pbuckley @pzeballos
• Add support for docker load (#254) @linus345

Upgrading

To upgrade, update your pipeline.yml files:

steps:
  - command: test.sh
    plugins:
-     docker#v5.8.0:
+     docker#v5.9.0:
        image: someimage
        workdir: /app