Allow slash-commands in Slack to get lunch or coffee suggestions.
You'll need a working .env file or some other way to get the two items in
.env-sample (but changed to your correct values) into the evnrionment
variables accessible by the code. Different hosting providers offer different
options. I use Zeit/now with their now secret option. Search their docs and
look at the now.json file in this repo to see how it works.