feat: add node 16 support, remove node 12

[ColinFrick]

Pull Request

Related issue

Fixes #229 Fixes #246 Fixes #153

What does this PR do?

• Changed CONTRIBUTING.md
• Change tests to run on 14, 16
• Execute publish with Node 14

PR checklist

Please check if your PR fulfills the following requirements:

• [x] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• [x] Have you read the contributing guidelines?
• [x] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!

[bidoubiwa]

bors r-

[bidoubiwa]

bors merge

[bidoubiwa]

bors merge

[bidoubiwa]

bors r-

[bidoubiwa]

bors r-

[bidoubiwa]

bors merge 🙏

[ColinFrick]

🙏

[bidoubiwa]

Well, difficult times require difficult decisions

[bidoubiwa]

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