Store last fm information into session (doesn't work yet)

lib/last_fm/api.ex

@@ -1,7 +1,7 @@
 defmodule LastFm.API do
   require Logger
 
-  alias LastFm.{Artist, Track}
+  alias LastFm.{Artist, Session, Track}
 
   defmodule ErrorResponse do
     defstruct [:error, :message]
@@ -71,6 +71,7 @@ defmodule LastFm.API do
     |> new_request()
     |> Req.merge(url: "/", params: params)
     |> Req.Request.append_response_steps(parse_error: &parse_error/1)
+    |> Req.Request.append_response_steps(parse_session: &parse_session/1)
     |> get_request()
   end
 
@@ -181,6 +182,11 @@ defmodule LastFm.API do
     request
   end
 
+  defp parse_session({request, response}) do
+    session = Session.parse(response.body)
+    {request, Map.put(response, :body, session)}
+  end
+
   defp parse_error({request, response}) do
     case response.body do
       %{"error" => error_number, "message" => message} ->