RawGit is being shut down ([source](https://rawgit.com/)), so it is necessary to migrate to a different CDN before October 2019. https://github.com/Mailtrain-org/mailtrain-wordpress-plugin/blob/master/mailtrain.php#L20
RawGit is being shut down (source), so it is necessary to migrate to a different CDN before October 2019.
https://github.com/Mailtrain-org/mailtrain-wordpress-plugin/blob/master/mailtrain.php#L20