Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/behat/mink/CONTRIBUTING.md

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+# Contributing
+Mink is an open source, community-driven project. If you'd like to contribute, feel free to do this, but remember to follow these few simple rules:
+
+## Submitting an issues
+- __Driver-related__ issues must be reported in the corresponding driver repository
+- A reproducible example is required for every bug report, otherwise it will most probably be __closed without warning__
+- If you are going to make a big, substantial change, let's discuss it first
+
+## Working with Pull Requests
+1. Create your feature addition or a bug fix branch based on `master` branch in your repository's fork.
+2. Make necessary changes, but __don't mix__ code reformatting with code changes on topic.
+3. Add tests for those changes (please look into `tests/` folder for some examples). This is important so we don't break it in a future version unintentionally.
+4. Commit your code, but do not mess with `CHANGES.md`.
+5. Squash your commits by topic to preserve a clean and readable log.
+6. Create Pull Request.
+
+# Running tests
+Make sure that you don't break anything with your changes by running:
+
+```bash
+$> phpunit
+```