v1.3.0

This release introduces the shims-effect subproject, which provides Effect[Task] as well as some other goodies related to cats-effect. The primary reason to include this functionality directly in shims, rather than in some other third-party project, is to ensure that the implicit prioritization is maintained correctly. Naively-implemented, an Effect[Task] would conflict with the monadToCats auto-coercion in shims core.

There was also a slight restructuring of the internal mixin structure to enable this project, as well as unforeseen third-party extensions.

This release is binary compatible with 1.2.