- added syllableHasJong and syllableCodeHasJong
- BREAKING CHANGE - Fix: inputting 아,ㄲ,ㅏ was producing "악가" instead of "아까"
- Dart version <4.0 instead of <3.0
- added method HangulInput.clear
- added method HangulInput.backspace
- added function isValidJamo
- added function isValidJamoCode
- added class HangulInput for creating hangul syllables from individual characters
- added example
- improved doc
- added tests
- standardized error messages
- initial release with basic