Update README.md

Author: echo724

README.md

@@ -1,5 +1,5 @@
 # Notion2Jekyll
 [![PyPI version](https://badge.fury.io/py/notion2jekyll.svg)](https://badge.fury.io/py/notion2jekyll)
 
-## Notion2Jekyll is merged with Notion2md. Please use Notion2md to export your notion page
+### Notion2Jekyll is merged with Notion2md. Please use Notion2md to export your notion page
 [https://github.com/echo724/notion2md](https://github.com/echo724/notion2md)