[google_maps_flutter] fix swift example in readme (#2428)

diff --git a/packages/google_maps_flutter/CHANGELOG.md b/packages/google_maps_flutter/CHANGELOG.md
index 856f7e3..9028c8c 100644
--- a/packages/google_maps_flutter/CHANGELOG.md
+++ b/packages/google_maps_flutter/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.5.21+17
+
+* Fix Swift example in README.md.
+
 ## 0.5.21+16
 
 * Fixed typo in LatLng's documentation.
diff --git a/packages/google_maps_flutter/README.md b/packages/google_maps_flutter/README.md
index b4a8465..a9436b3 100644
--- a/packages/google_maps_flutter/README.md
+++ b/packages/google_maps_flutter/README.md
@@ -68,7 +68,7 @@
 @objc class AppDelegate: FlutterAppDelegate {
   override func application(
     _ application: UIApplication,
-    didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
   ) -> Bool {
     GMSServices.provideAPIKey("YOUR KEY HERE")
     GeneratedPluginRegistrant.register(with: self)
diff --git a/packages/google_maps_flutter/pubspec.yaml b/packages/google_maps_flutter/pubspec.yaml
index a56c253..77510d0 100644
--- a/packages/google_maps_flutter/pubspec.yaml
+++ b/packages/google_maps_flutter/pubspec.yaml
@@ -1,7 +1,7 @@
 name: google_maps_flutter
 description: A Flutter plugin for integrating Google Maps in iOS and Android applications.
 homepage: https://github.com/flutter/plugins/tree/master/packages/google_maps_flutter
-version: 0.5.21+16
+version: 0.5.21+17
 
 dependencies:
   flutter: