0.21.2: Fel d 1

Breaking

• None.

Enhancements

• Add support for C-language annotations
  (e.g. __attribute__((annotate("This is an annotation")))).
  Jeff Verkoeyen

• Improve support for building & running with Swift 4.2.
  Norio Nomura

• Add new values for SwiftDeclarationAttributeKind and SyntaxKind with
  Swift 4.2.
  JP Simard

Bug Fixes

• None.