v0.7.0

• BREAKING CHANGE - replaced assert with throwing ArgumentError in:
  • syllableHasJong
  • syllableCodeHasJong
  • HangulSyllable.fromString
  • HangulSyllable.fromCharCode
  • HangulSyllable.cho setter
  • HangulSyllable.jung setter
  • HangulSyllable.jong setter

// before (AssertionError) 
try {
  HangulSyllable.fromString(someString);
} catch (AssertionError e) {
  print(e);
}

// after (ArgumentError)
try {
  HangulSyllable.fromString(someString);
} catch (ArgumentError e) {
  print(e);
}