After activating the plugin for the first time I get these notices appearing in the admin. I have WP_DEBUG turned on
Notice: Use of undefined constant WP_GITHUB_FORCE_UPDATE - assumed 'WP_GITHUB_FORCE_UPDATE' in /wp-content/plugins/edd-beta-tester/classes/class-edd-github-updater.php on line 47
Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/edd-beta-tester/classes/class-edd-github-updater.php:47) in /wp-includes/option.php on line 563
Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/edd-beta-tester/classes/class-edd-github-updater.php:47) in /wp-includes/option.php on line 564