Post new users setting up Roar to Slack channel

[will-weiss]

Context

We want to be on the ball when new users first log in using Roar so that we can follow up with a personal email saying thanks for the install. To that end, we'd want to send a message to the #roars Slack channel the first time any user logs into Roar.

TODO

• Generate API key
• [ ]

https://github.com/smallwins/slack