drop ruby `< 2.3` as they are EOL and appease the cops

[majormoses]

Signed-off-by: Ben Abrams me@benabrams.it

Description

Drop EOL rubies, add new ruby to be tested, and appeased the cops.

Motivation and Context

fixes #199

How Has This Been Tested?

only through automated tests currently, I can look at testing this in my env at some point.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have updated the Changelog following the conventions laid out on Keep A Changelog

Known Caveats

drops support for ruby < 2.3 as they are EOL.