Add ability to set a default post expiry (#321)

[akkoma] / priv / repo / migrations / 20191123030554_add_activitypub_actor_type.exs

defmodule Pleroma.Repo.Migrations.AddActivitypubActorType do
  use Ecto.Migration

  def change do
    alter table("users") do
      add(:actor_type, :string, null: false, default: "Person")
    end
  end
end