Update codebase

[MichaelDeBoey]

• Update dependencies
• Update template (also dependencies)
• Bring codebase in line with template
• BREAKING: Drop Node 8 support (Because it's no longer LTS).

[MichaelDeBoey]

No problem at al! 😉

Resolved everything and left some small questions for you to answer 🙂

[kentcdodds]

:tada: This PR is included in version 4.0.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: