v1.2.0

• Add support for destructuring assignments

Bump to v1.1.0 for publishing

• Extract composition detection logic from propTypeHandler into
  propTypeCompositionHandler. propTypeHandler still delegates to
  propTypeCompositionHandler for backwards compatibility.
• Expose an array of default handlers as defaultHandlers on the root
  object.
• Relax requirements for composition detection in spread properties (see
  878d57d).