docs: remove pre iOS10 information from README (#209)

Author: Naturalclar

README.md

@@ -93,11 +93,6 @@ At the top of the file:
 Then, add the following lines:
 
 ```objective-c
-// Required to register for notifications
-- (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings
-{
- [RNCPushNotificationIOS didRegisterUserNotificationSettings:notificationSettings];
-}
 // Required for the register event.
 - (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
 {
@@ -114,7 +109,7 @@ fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
 {
  [RNCPushNotificationIOS didFailToRegisterForRemoteNotificationsWithError:error];
 }
-// IOS 10+ Required for localNotification event
+// Required for localNotification event
 - (void)userNotificationCenter:(UNUserNotificationCenter *)center
 didReceiveNotificationResponse:(UNNotificationResponse *)response
          withCompletionHandler:(void (^)(void))completionHandler

example/App.js

@@ -266,6 +266,7 @@ export const App = () => {
         onPress={sendSilentNotification}
         label="Send fake silent notification"
       />
+
       <Button
         onPress={() => PushNotificationIOS.setApplicationIconBadgeNumber(42)}
         label="Set app's icon badge to 42"

example/ios/example/AppDelegate.m

@@ -78,13 +78,6 @@ - (void)userNotificationCenter:(UNUserNotificationCenter *)center
                     UNAuthorizationOptionBadge);
 }
 
-// Required to register for notifications
-- (void)application:(UIApplication *)application
-    didRegisterUserNotificationSettings:
-        (UIUserNotificationSettings *)notificationSettings {
-  [RNCPushNotificationIOS
-      didRegisterUserNotificationSettings:notificationSettings];
-}
 // Required for the register event.
 - (void)application:(UIApplication *)application
     didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
@@ -106,12 +99,7 @@ - (void)application:(UIApplication *)application
   [RNCPushNotificationIOS
       didFailToRegisterForRemoteNotificationsWithError:error];
 }
-// Required for the localNotification event.
-- (void)application:(UIApplication *)application
-    didReceiveLocalNotification:(UILocalNotification *)notification {
-  [RNCPushNotificationIOS didReceiveLocalNotification:notification];
-}
-// IOS 10+ Required for local notification tapped event
+// Required for local notification tapped event
 - (void)userNotificationCenter:(UNUserNotificationCenter *)center
     didReceiveNotificationResponse:(UNNotificationResponse *)response
              withCompletionHandler:(void (^)(void))completionHandler {