Update project to Swift 4.2

.swift-version

@@ -1 +1 @@
-4.1
+4.2

Anchors.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
   s.name             = "Anchors"
   s.summary          = "Declarative, extensible, powerful Auto Layout for iOS and macOS"
-  s.version          = "2.3.0"
+  s.version          = "2.4.0"
   s.homepage         = "https://github.com/onmyway133/Anchors"
   s.license          = 'MIT'
   s.author           = { "Khoa Pham" => "[email protected]" }
@@ -21,5 +21,5 @@ Pod::Spec.new do |s|
   s.ios.frameworks = 'UIKit', 'Foundation'
   s.osx.frameworks = 'Cocoa', 'Foundation'
 
-  s.pod_target_xcconfig = { 'SWIFT_VERSION' => '4.1' }
+  s.pod_target_xcconfig = { 'SWIFT_VERSION' => '4.2' }
 end

Anchors.xcodeproj/project.pbxproj

@@ -742,7 +742,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -795,7 +795,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";

Sources/Core/Types.swift

@@ -3,8 +3,8 @@
   public typealias View = UIView
   public typealias EdgeInsets = UIEdgeInsets
   public typealias LayoutGuide = UILayoutGuide
-  public typealias Relation = NSLayoutRelation
-  public typealias Attribute = NSLayoutAttribute
+  public typealias Relation = NSLayoutConstraint.Relation
+  public typealias Attribute = NSLayoutConstraint.Attribute
 #elseif os(OSX)
   import AppKit
   public typealias View = NSView