Version 3.0.0

Major

• Updated the package engines.node field to ^10.17.0 || ^12.0.0 || >= 13.7.0.
• Updated dev dependencies, some of which require newer Node.js versions than previously supported.
• Removed the package module and sideEffects fields.
• Changed the file structure, so deep import/require paths may need to be updated.

Patch

• Updated the package keywords field.
• Also run GitHub Actions with Node.js v15, and not v13.
• Simplified the GitHub Actions CI config with the npm install-test command.
• Updated EditorConfig.
• Correct the supported Node.js versions documented in the readme.
• Prettier JSDoc example code.
• Documented how to import or require the disposableDirectory function.