Log Discogs API errors

lib/discogs/api.ex

@@ -32,6 +32,7 @@ defmodule Discogs.API do
     )
     |> Req.Request.merge_options(config.req_options)
     |> Req.Request.append_request_steps(log_attempt: &log_attempt/1)
+    |> Req.Request.append_response_steps(log_error: &log_error/1)
   end
 
   defp get_request(request) do