docs(semantic-release): implement an automated changelog

[daks]

Implement semantic-release on fail2ban-formula.
I also implemented a very basic test which needs to be expanded to be useful.

I also discovered this formula has ng states so implementing versioning is a first step to be able to get rid of those.

[myii]

Great work, I'll look at this shortly. One initial comment: do you mind limiting Travis to 5 instances, as we've discussed in this issue? Kitchen config is fine since those can still be run locally.

[myii]

To be clear, I'm intending to go back to all semantic-release formulas and propose the same thing there, unless there is some justification.

[myii]

This is an approval, really. Just some minor suggestions to either implement or ignore.

[myii]

@daks Thanks for this PR. The final point is it this is more of a feat than a docs. I'm not sure how we ended up with that commit type!

[daks]

@myii not sure, but nearly all are of type 'docs', will change the commit message

[myii]

Thanks for another brilliant contribution @daks!

[daks]

thanks for the merge

[saltstack-formulas-travis]

🎉 This PR is included in version 0.15.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀