Add copyright header

priv/repo/migrations/20201012173004_refactor_deactivated_user_field.exs

@@ -1,3 +1,7 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Repo.Migrations.RefactorDeactivatedUserField do
   use Ecto.Migration