Merge pull request #12 from rebeloper/master

SPM fix

Author: srdanrasic

Sources/Layout/ChildNode.swift

@@ -22,6 +22,8 @@
 //  THE SOFTWARE.
 //
 
+import UIKit
+
 /// A decorator over child layout node that provides a way for the child to layout itself
 /// with the respect to the parent it will eventually be added to.
 public class ChildNode<Child: LayoutNode>: LayoutNode, Anchorable where Child: Anchorable {

Sources/Layout/Layout.swift

@@ -22,6 +22,8 @@
 //  THE SOFTWARE.
 //
 
+import UIKit
+
 /// A type that represents layout calculation as a closure.
 public struct Layout<LayoutNode: Layoutless.LayoutNode>: LayoutProtocol {
 

Sources/Layout/LayoutProtocol.swift

@@ -23,6 +23,7 @@
 //
 
 import Foundation
+import UIKit
 
 /// A type-erased `LayoutProtocol`.
 public protocol AnyLayout: LayoutNode {