Set the API key as an environment variable before running: RIOT_API_KEY=<xyz> iex -S mix
or export RIOT_API_KEY=<xyz>
and run iex -S mix
afterwards
Or you can set it directly in the dev config with the following:
config :blitz, riot_api_key: "RGAPI-<my key>"
mix deps.get
iex -S mix
Blitz.main("summoner name", "region")