Hello!

When using the generated auth files from mix phx.gen.auth attempting to turn socket = mount_current_user(session, socket) into a pipeline requires the user reorder the arguments.

If we change mount_current_user to follow the general Elixir convention of the struct being transformed as the first argument it becomes easy to turn socket = mount_current_user(socket, session) into:

    socket =
      socket
      |> mount_current_user(session)
      |> mount_session_id(session)
      |> mount_another_thing(session)