- Remove OpenBSD 5.9 platform from testing, it never worked and it's not supported upstream anymore now that OpenBSD 6.1 was released.

- Stop testing with Docker containers, they're only a good fit for a very limited use (cli applications, not services or system-level) and the speed of testing doesn't justify the work needed.

- Replaced Debian Wheezy and Jessie Vagrant boxes.

- Build on my supported platforms (some don't have properly working Vagrant boxes so they're allowed to fail).

- Use privileged container instead of just adding the sys_admin capability (the latter has been shown to be cause unrelated issues).

accordingly.

- Add pre-commit check for out-of-date dependencies.
- Add flake8 pre-commit check.
- List roles needed for testing (bootstraping) at
tests/requirements.yml, leave other dependencies at meta/main.yml.
- Update molecule.yml, ansible.cfg for newer versions of Molecule.
- Update documentation, playbook accordingly.

  issues:
  - Missed a blank line between tests in `tests/test_example.py`.
  - Named the assertions task.
- Updated the OpenBSD Vagrant box to 6.0, updated assertion accordingly.

- Enabled diff.