The README.md file for this project is not properly formatted. Sometimes this can happen when projects are ported over from Drupal, since there wasn't a lot of direction on formatting of Drupal's README.txt files.
It is especially important to keep the readme files clean for Backdrop projects because that is what is used for the project page on backdropcms.org. Take a look at the page for this project to see the problem: https://backdropcms.org/project/date_all_day
The README.md file for this project is not properly formatted. Sometimes this can happen when projects are ported over from Drupal, since there wasn't a lot of direction on formatting of Drupal's README.txt files.
Please refer to our contributor guidelines for an example README.md file that you can copy. The main problem is the HTML formatting, that should be removed. Markdown files (ending in .md) have their own formatting similar to what we use here on GitHub :)
It is especially important to keep the readme files clean for Backdrop projects because that is what is used for the project page on backdropcms.org. Take a look at the page for this project to see the problem: https://backdropcms.org/project/date_all_day