I made a small change to the ReqAOC fetch! function signature because I thought it looked nicer 
Originally I was going to handle the session token behind the scenes, but Livebook is soooo good that the explicit version arguably provides better UX:
Mix.install([
{:req_aoc, github: "mcrumm/req_aoc", ref: "eef58c9"}
])
System.fetch_env!("LB_AOC_SESSION") |> ReqAOC.fetch!({2022, 03}, max_retries: 0)
…it will prompt you to add/grant access to the app secret if it does not already exist!
EDIT: Run in Livebook
