Update README.ja.md

Author: otoyo

README.ja.md

@@ -5,7 +5,7 @@
 [![GitHub stars](https://img.shields.io/github/stars/otoyo/easy-notion-blog)](https://github.com/otoyo/easy-notion-blog/stargazers)
 [![GitHub license](https://img.shields.io/github/license/otoyo/easy-notion-blog)](https://github.com/otoyo/easy-notion-blog/blob/master/LICENSE)
 
-<img src="https://user-images.githubusercontent.com/1063435/155871688-aeb3a7ea-28cb-4b84-bcde-eafc7a2a859a.png" width="480">
+<img src="https://user-images.githubusercontent.com/1063435/201917958-432ebbcb-6960-4106-8fd2-9ddcd7539781.jpg" width="480">
 
 easy-notion-blog を使えばあっという間に Notion Blog を始めることができます。