New Features
- Add optional id, customTags arguments to Document#setSchema()
- Keep explicit keys with block scalar values as such
- Add simpleKeys option (#122)
Improved Errors & Warnings
- Add more context to pretty error messages
- Improve error for missing flow collection terminator char
- Use offset when prettifying flow collection character errors
- Add warning when stringifying map/seq-valued keys for JS Object
- Use process.emitWarning rather than console.warn in YAML.parse if possible