Fix build

Author: Luc Dion

Sources/Extensions/PEdgeInsets+Operators.swift

@@ -1,3 +1,8 @@
+#if os(iOS) || os(tvOS)
+import UIKit
+#else
+import AppKit
+#endif
 
 public extension PEdgeInsets {
     public func minInsets(_ insets: PEdgeInsets) -> PEdgeInsets {