v0.6.0

• Breaking change: TypeChecker#annotationsOf|firstAnnotationOf now
  returns annotations that are assignable to the TypeChecker's type. As a
  result we've added #annotationsOfExact|firstAnnotationOfExact which has the
  old behavior for precise checks.

• TypeChecker#annotations...-methods now throw a StateError if one or more
  annotations on an element are not resolvable. This is usually a sign of a
  mispelling, missing import, or missing dependency.

• Added TypeChecker.any, which delegates to multiple other TypeChecker
  implementations when making a type check.