Prospective v0.4.1

• Update LICENSE for 2021.
• Build with Node.js 10, 12, 14 and 15 on CI/CD.

Closes #27.

Prospective v0.4.0

• Fix once multiple events.

Closes #26.

Prospective v0.3.0

• Convert async/await to callback. Closes #24.

Closes #25.

Prospective v0.2.0

• Upgrade Proof to 9.0.0. Closes #22.
• Update LICENSE for 2020. Closes #21.

Closes #23.

Prospective v0.1.0-alpha.4

• Remove /.dots from .gitignore. Closes #19.

Closes #20.

Prospective v0.1.0-alpha.3

• Remove scrap file. Closes #17.

Closes #18.

Prospective v0.1.0-alpha.2

• Create Markdown readme with badges. Closes #15.
• Convert README.md to Markdown. See #15.
• Build with Actions, ship coverage to Codecov. Closes #14. Closes #13.
• Tidy .travis.yml. Closes #12.
• Tidy .gitignore. Closes #11.
• Convert test to Proof. Closes #10.

Closes #16.