0.7.2: 素早い子猫

a.k.a "0.7.2: Quick Kitten"

Big thanks to @norio-nomura for the improvements in this release! 👏

• Optimize NSString.lineAndCharacterForCharacterOffset(...),
  NSString.NSRangeToByteRange(...) and
  SyntaxMap.commentRangeBeforeOffset(_:).
  Norio Nomura
  #119
• Fix unicode handling of String.commentBody(range:).
  Norio Nomura