Release steps

• Ensure master passes CI tests
• Bump version in package.json. Any breaking change or new feature should bump minor (or even major). Non-breaking changes or fixes can just bump patch.
• Update README manually if the changes are not documented in-code. If so, run scripts/generate-docs.js
• Commit
• $ git tag <version> (see git tag -l for latest)
• $ git push origin master --tags
• $ npm publish .