Edify v0.3.0

• Upgrade arguable to ^13.0.0-alpha.1.
• Build with Node.js 12 at GitHub Actions.
• Build with Node.js 12 at Travis CI.
• Fix includes for text generation.
• nyc with Node.js 12 adds coverage to test.
• Update package.json keywords.
• Update package.json description.
• Update LICENSE for 2021.
• Tidy .gitignore. Closes #27.
• Update README.md description.
• Add CI/CD.
• Generate README.md.
• Use this repo for literate programming util.
• Upgrade proof to ^9.0.3.
• Upgrade arguable to ^12.0.5.
• Upgrade marked to 1.2.7.
• Upgrade cheerio to 1.0.0-rc.5.
• Upgrade proof to ^9.0.3.
• Upgrade arguable to ^12.0.5.
• Upgrade extant to ^1.0.21.
• Upgrade cheerio to 1.0.0-rc.5.
• Fix table in README.md.
• Try to perserve the edify root test.
• Fix NPM install of packages.
• Install sub-project NPM for GitHub Actions.
• Replace Prospective with Eject.
• Upgrade arguable to 12.0.5.
• Upgrade highlight.js to 10.5.0.
• Upgrade cheerio to 1.0.0-rc.5.
• Replace Prospective with Eject.

Closes #116.