0.30.0: Cats Don't Wear Masks

Breaking

• SourceKitten now requires Swift 5.1 or higher to build.
  JP Simard

Enhancements

• Update Yams to 4.0.0.
  Keith Smiley
  JP Simard

• Add SwiftDeclarationAttributeKind values introduced in Swift 5.2.
  JP Simard

Bug Fixes

• Fix crashes when parsing .m files.
  Joe Laws

• Stop the program immediately if the xcodebuild command fails.
  John Fairhurst
  #643