feat(semantic-release): implement for this formula

[myii]

PR progress checklist (to be filled in by reviewers)

• [ ] Changes to documentation are appropriate (or tick if not required)
• [ ] Changes to tests are appropriate (or tick if not required)
• [ ] Reviews completed

---

What type of PR is this?

Primary type

• [ ] [build] Changes related to the build system
• [ ] [chore] Changes to the build process or auxiliary tools and libraries such as documentation generation
• [x] [ci] Changes to the continuous integration configuration
• [x] [feat] A new feature
• [x] [fix] A bug fix
• [ ] [perf] A code change that improves performance
• [ ] [refactor] A code change that neither fixes a bug nor adds a feature
• [ ] [revert] A change used to revert a previous commit
• [x] [style] Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc.)

Secondary type

• [x] [docs] Documentation changes
• [x] [test] Adding missing or correcting existing tests

Does this PR introduce a BREAKING CHANGE?

No.

Related issues and/or pull requests

• Semi-automated using https://github.com/myii/ssf-formula/pull/108

Describe the changes you're proposing

Standard semantic-release PR, with the following notes:

• Haven't removed the previous testinfra tests, that can be done after this PR is merged.
• This process has revealed that this formula only works reliably for Debian-based systems (within the Linux distros); the problems encountered will be raised in a separate issue.
• Using the test pillar to install the latest stable version, 4.2.

Pillar / config required to test the proposed changes

As provided.

Debug log showing how the proposed changes work

As shown in Travis.

Documentation checklist

• [x] Updated the README (e.g. Available states).
• [x] Updated pillar.example.

Testing checklist

• [x] Included in Kitchen (i.e. under state_top).
• [x] Covered by new/existing tests (e.g. InSpec, Serverspec, etc.).
• [x] Updated the relevant test pillar.

Additional context

[saltstack-formulas-travis]

:tada: This PR is included in version 0.19.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket:

[daks]

good job @myii :)

[myii]

Thanks!