Upgrade Swift to version 4.2

Author: mvanbeusekom

example/ios/Runner.xcodeproj/project.pbxproj

@@ -445,7 +445,7 @@
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				VALID_ARCHS = "arm64 armv7 armv7s";
 				VERSIONING_SYSTEM = "apple-generic";
 			};
@@ -473,7 +473,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
 				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 				VERSIONING_SYSTEM = "apple-generic";
 			};
 			name = Release;

example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>BuildSystemType</key>
+	<string>Original</string>
+</dict>
+</plist>

example/ios/Runner/AppDelegate.swift

@@ -5,7 +5,7 @@ import Flutter
 @objc class AppDelegate: FlutterAppDelegate {
   override func application(
     _ application: UIApplication,
-    didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
   ) -> Bool {
     GeneratedPluginRegistrant.register(with: self)
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)

ios/google_api_availability.podspec

@@ -3,7 +3,7 @@
 #
 Pod::Spec.new do |s|
   s.name             = 'google_api_availability'
-  s.version          = '1.0.4'
+  s.version          = '1.0.5'
   s.summary          = 'A Flutter plugin to check the availability of Google Play Services on an Android device.'
   s.description      = <<-DESC
 A Flutter plugin to check the availability of Google Play Services on an Android device.
@@ -15,7 +15,7 @@ A Flutter plugin to check the availability of Google Play Services on an Android
   s.source_files = 'Classes/**/*'
   s.public_header_files = 'Classes/**/*.h'
   s.dependency 'Flutter'
-  
+  s.swift_version = '4.2'
   s.ios.deployment_target = '8.0'
 end