Icons in Review Submit

[josephcrawfordSRH]

I tend to put icons in my PR approvals so that we can see at a quick glance that I approved it, I tried to use :books as a test but that did not actually put the emoji in place. I know you can do it with reactions, is there a way to do it in the message for approving a PR?

[wd60622]

Closing in favor of the issue #646