Update README.md

Author: andrei-m-code

README.md

@@ -92,7 +92,7 @@ await apn.SendAsync(notification, deviceToken);
 Please see Apple notification format examples here: https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/CreatingtheNotificationPayload.html#//apple_ref/doc/uid/TP40008194-CH10-SW1.
 Tip: To send properties like {"content-available": true} you can use Newtonsoft.Json attributes over C# properties like `[JsonProperty("content-available")]`.
 
-# Examples of notification payload
+## Examples of notification payload
 You can find expected notification formats for different types of notifications in the documentation. To make it easier to get started, here is a simple example of visible notification (the one that you'll see in phone's notification center) for iOS and Android:
 
 ```csharp