You can access the readme file of the most recent release of the WordPress product with “paddlepress_download_info” shortcode.
For example:
[paddlepress_download_info download_tag="foo-bar" beta="false" sections="changelog"]
will display the changelog section of the downloadable item tagged with “foo-bar”. If you need to display entire readme file, you can remove “sections” parameter or leave it blank.
This is particularly useful when you want to show the changelog on the product page.