Updated p5-Specio to 0.28.

0.28    2016-10-02

- Added a Test::Specio module to provide helpers for testing Specio libraries.

- Fixed another bug with a subtype of special types and inlining.

0.27    2016-10-01

- Cloning a type with coercions defined on it would cause an exception.

- Creating a subtype of a special type created by *_isa_type, *_can_type, or
  *_does_type, or enum would die when trying to inline the type constraint.

- Removed the never-documented Any type.

- Added documentation for each type in Specio::Library::Builtins.

(wiz)