update README.md

Author: Анатолий Нехай

README.md

@@ -12,7 +12,7 @@
 ## Installation
 
 ```bash
-composer require 'sunrise/http-router:^2.14'
+composer require 'sunrise/http-router:^2.15'
 ```
 
 ## Support for OpenAPI (Swagger) Specification (optional)
@@ -470,6 +470,14 @@ final class SomeController
 
 ## Useful to know
 
+### JSON-payload decoding
+
+```php
+use Sunrise\Http\Router\Middleware\JsonPayloadDecodingMiddleware;
+
+$router->addMiddleware(new JsonPayloadDecodingMiddleware());
+```
+
 ### Get a current route
 
 #### Through Router