Cubbyhole v4.0.9

• Upgrade perhaps to 0.0.13.
• Update LICENSE for current year.

Closes #57.

Cubbyhole v4.0.8

• Upgrade perhaps to 0.0.12.

Closes #56.

Cubbyhole v4.0.7

• Convert README.md to Edify.

Closes #55.

Cubbyhole v4.0.6

• Upgrade vivifyer to ^3.0.0.

Closes #54.

Cubbyhole v4.0.5

• Upgrade perhaps to 0.0.11.
• Build with Node.js 16 on GitHub Actions.
• Build with Node.js 16 on Travis CI.

Closes #53.

Cubbyhole v4.0.4

• Upgrade perhaps to 0.0.10.

Closes #52.

Cubbyhole v4.0.3

• Upgrade perhaps to 0.0.9.

Closes #51.

Cubbyhole v4.0.2

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

Closes #50.

Cubbyhole v4.0.1

• Get a list of unawaited promises.
• 100% test coverage.
• Replace internal future with Perhaps.

Closes #49.

Cubbyhole v4.0.0

• Upgrade prospective to ^0.2.0. Closes #47.
• Upgrade proof to ^9.0.1. Closes #46.
• Update LICENSE for 2020. Closes #45.

Closes #48.