Release 2.0.0

New: Relative constraint sweetness, eg: view.leftToRight(of: otherView)
New: Custom relations like equalOrLess and equalOrGreater.
Fix: Default layout priority is now .required.

Release 1.2.1

Add MacOS support.

Release 1.2.0

Support tvOS.
Support for UILayoutGuide.
Add sugar for UILayoutPriority.