A tiny example bot. Replies to app_mention events and logs everything else.
Run it in IEx (Socket Mode):
iex -S mix
iex> {:ok, _} = Slink.SocketMode.start_link(
...> module: Slink.ExampleBot,
...> app_token: System.fetch_env!("SLACK_APP_TOKEN"),
...> bot_token: System.fetch_env!("SLACK_BOT_TOKEN"))