- Added support for Flesch-Kincaid readability score
- Added support for rare word detection
- Added support for E006: Abbreviations should be written in full. (can be disabled by ignore_rules)
- Added support for E007: Exclamation marks are inappropriate. (can be disabled by ignore_rules)
- Redesigned the API to be more user friendly
- Some minor bug fixes
Full Changelog: 3.4.7...4.0.0