[feature proposal] Email recepient choice

Hi, Thanks for this very useful plugin. I had to make a little hack in the code to satisfy my requirement of sending notification emails to both admins and editors. My proposal is changing radio buttons for “Post Submitted for Review” and “Post Was Published” to checkboxes. And if possible, adding textboxes for additional email recipients. Thanks in advance for consideration! https://wordpress.org/plugins/wpsite-post-status-notifications/