message: doc: Add link to commit guidelines to contributing guide
  This adds a reference to the commit guidelines to the contributing guide.
  Fixes
  Change-Type: patch
diff: @@ -28,6 +28,12 @@ other text editing default. We encourage you to install the relevant plugin in
  your text editor of choice to avoid having to fix any issues during the review
  process.
  +Commit Guidelines
  +-----------------
  +
  +See [COMMIT-GUIDELINES.md][COMMIT-GUIDELINES] for a thorough guide on how to
  +write commit messages.
  +
  Updating a dependency
  ---------------------
  @@ -128,6 +134,7 @@ Don't hesitate to get in touch if you have any questions or need any help!
  [ARCHITECTURE]: https://github.com/resin-io/etcher/blob/master/docs/ARCHITECTURE.md
  [RUNNING-LOCALLY]: https://github.com/resin-io/etcher/blob/master/docs/RUNNING-LOCALLY.md
  +[COMMIT-GUIDELINES]: https://github.com/resin-io/etcher/blob/master/docs/COMMIT-GUIDELINES.md
  [EditorConfig]: http://editorconfig.org
  [shrinkwrap]: https://docs.npmjs.com/cli/shrinkwrap
  [hxd]: https://github.com/jhermsmeier/hxd
  