Interrupt v11.0.0-alpha.0

• Fix callee argument. Closes #106.
• Diary about formatted messages. See #97.
• Remove properties argument. Closes #105.
• Upgrade keyify to 2.0.5. Closes #104.
• Scratch out some more Docco. See #97.
• Rename your Docco readme.
• Use whitespace/non-whitespace character class. See #102.
• Add messages property to generated class. Closes #103.
• Notes on parsing stack traces. See #102.
• There will be no prefixes appended to codes. See #96.
• Notes on what happens when a stack is a biggun.
• Implement prune of repeated causes. Closes #101.
• Build with only Node.js 12 on GitHub Actions. Closes #100.
• Build with only Node.js 12 on Travis CI. Closes #99.
• Export Iterator class. Closes #98.
• Swipe at some Docco based documentation. See See #97.
• Implement error code to message format map. Closes #96.
• Implement formatted error messages. Closes #95.

Closes #107.