Update to Xcode 9.3 & Swift 4.1

.swift-version

@@ -1 +1 @@
-4.0
+4.1

.travis.yml

@@ -1,5 +1,5 @@
 language: objective-c
-osx_image: xcode9.1
+osx_image: xcode9.3
 branches:
   only:
     - master
@@ -13,7 +13,7 @@ env:
   matrix:
 
     - DESTINATION="OS=10.0,name=iPhone 7"           SCHEME="$IOS_FRAMEWORK_SCHEME"    RUN_TESTS="NO" BUILD_EXAMPLE="YES"  CODE_COV="NO"
-    - DESTINATION="OS=11.1,name=iPad Pro (9.7-inch)"     SCHEME="$IOS_FRAMEWORK_SCHEME"     RUN_TESTS="NO" BUILD_EXAMPLE="YES"  CODE_COV="NO"
+    - DESTINATION="OS=11.3,name=iPad Pro (9.7-inch)"     SCHEME="$IOS_FRAMEWORK_SCHEME"     RUN_TESTS="NO" BUILD_EXAMPLE="YES"  CODE_COV="NO"
 
 script:
   - set -o pipefail

HueKit.xcodeproj/project.pbxproj

@@ -151,7 +151,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0930;
-				LastUpgradeCheck = 0900;
+				LastUpgradeCheck = 0930;
 				ORGANIZATIONNAME = "Silver Fox";
 				TargetAttributes = {
 					BE5C1E161F3266B600B0080C = {
@@ -227,6 +227,7 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -234,6 +235,7 @@
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
@@ -287,6 +289,7 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -294,6 +297,7 @@
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;

HueKit/Model/HSV.swift

@@ -9,7 +9,7 @@
 import Foundation
 import CoreGraphics
 
-public struct HSV {
+public struct HSV: Hashable {
 	/// In degrees (range 0...360)
 	public var h: CGFloat
 	

HueKit/Model/RGB.swift

@@ -9,7 +9,7 @@
 import Foundation
 import CoreGraphics
 
-public struct RGB {
+public struct RGB: Hashable {
 	/// In range 0...1
 	public var r: CGFloat
 	

README.md

@@ -5,7 +5,7 @@
 <p align="center">
 <a href="https://travis-ci.org/louisdh/huekit"><img src="https://travis-ci.org/louisdh/huekit.svg?branch=master" style="max-height: 300px;" alt="Build Status"/></a>
 <br>
-<a href="https://developer.apple.com/swift/"><img src="https://img.shields.io/badge/Swift-4.0-orange.svg?style=flat" style="max-height: 300px;" alt="Swift"/></a>
+<a href="https://developer.apple.com/swift/"><img src="https://img.shields.io/badge/Swift-4.1-orange.svg?style=flat" style="max-height: 300px;" alt="Swift"/></a>
 <a href="https://cocoapods.org/pods/HueKit"><img src="https://img.shields.io/cocoapods/v/HueKit.svg" style="max-height: 300px;" alt="Pod Version"/></a>
 <a href="https://github.com/Carthage/Carthage"><img src="https://img.shields.io/badge/Carthage-compatible-4bc51d.svg?style=flat" style="max-height: 300px;" alt="Carthage Compatible"/></a>
 <img src="https://img.shields.io/badge/platform-iOS-lightgrey.svg" style="max-height: 300px;" alt="Platform: iOS">
@@ -67,7 +67,7 @@ Run ```carthage update``` to build the framework and drag the built ```HueKit.fr
 ## Requirements
 
 * iOS 10.0+
-* Xcode 9.0+
+* Xcode 9.3+
 
 ## Todo