Updated with the latest blog posts

Author: blog-post-bot

README.md

@@ -320,6 +320,7 @@ Like <img src="https://raw.githubusercontent.com/AlexRogalskiy/java-patterns/mas
 ### _Inside Java posts_
 
 <!-- INSIDE-POST-LIST:START -->
+- [New candidate JEP: 409: Sealed Classes](https://inside.java/2021/04/07/new-candidate-jep-409/)
 - [Record Serialization in Practice](https://inside.java/2021/04/06/record-serialization-in-practise/)
 - [The Vector API: SIMD Programming in Java](https://inside.java/2021/04/06/video-odl16-vectorapi/)
 - [Java 16 - Consistency and Innovation](https://inside.java/2021/04/05/video-odl16-consistency-and-innovation/)
@@ -329,7 +330,6 @@ Like <img src="https://raw.githubusercontent.com/AlexRogalskiy/java-patterns/mas
 - [Important clarification on the com.sun namespace](https://inside.java/2021/03/30/com-sun-namespace/)
 - [Proposed schedule for JDK 17](https://inside.java/2021/03/30/jdk17-proposed-schedule/)
 - [New candidate JEP: 408: Simple Web Server](https://inside.java/2021/03/29/new-candidate-jep-408/)
-- [New candidate JEP: 405: Record Patterns &amp; Array Patterns (Preview)](https://inside.java/2021/03/26/new-candidate-jep-405/)
 <!-- INSIDE-POST-LIST:END -->
 
 ### _Java programmer posts_