Project description links to READMEs per branch

The readme file for installation does not discuss version 8.x-2.x-dev which needs version 4.4.0 of the fullcalendar library. I was able to get that installed using composer by adding these lines to my composer.json:

      {
        "type": "package",
        "package": {
          "name": "fullcalendar/fullcalendar",
          "version": "4.4.0",
          "type": "drupal-library",
          "dist": {
            "url": "https://github.com/fullcalendar/fullcalendar/releases/download/v4.4.0/fullcalendar-4.4.0.zip",
            "type": "zip"
          }
        }
      }

Instead of the lines mentioned in the readme.