Explicitly set auto-refresh config for LastFm refresh

lib/last_fm/config.ex

@@ -3,19 +3,16 @@ defmodule LastFm.Config do
           api: module(),
           api_key: String.t(),
           user: String.t(),
+          auto_refresh: boolean(),
           refresh_interval: pos_integer()
         }
 
   defstruct api: LastFm.Api,
             api_key: "",
             user: "",
+            auto_refresh: true,
             refresh_interval: 60_000
 
-  @spec enabled?(t) :: boolean()
-  def enabled?(config) do
-    config.api && config.user !== "" && config.api_key !== ""
-  end
-
   @spec resolve(atom) :: t
   def resolve(otp_app) do
     app_config =

lib/last_fm/refresh.ex

@@ -20,7 +20,7 @@ defmodule LastFm.Refresh do
   @impl true
   @spec init(config) :: {:ok, config, {:continue, :refresh}} | :ignore
   def init(config) do
-    if Config.enabled?(config) do
+    if config.auto_refresh do
       {:ok, config, {:continue, :refresh}}
     else
       :ignore