v2.1.0

Fixes for TypeScript users. Arguably this could've been a patch release as well.

• Improve/specify/fix TS types for Document & collection access methods (#383)
• Use TS named tuple for range (#385)
• Rename internal Document option as _directives to resolve type conflict with ToString options (#389)
• Update tsc target to ES2020 to match Node.js support
• Update dev dependencies, including jest 28