Add Discord/Slack Integration

[adamjsturge]

I wrote an article about how to set it up https://adamjsturge.medium.com/easy-xsshunter-discord-alerts-33fcff24a8f7?sk=42acf215a6d392cf554b63071e813360 with my script. I think this is a worth add, I've been using the slack one for a while and it's been great