update

phoenix/deps/ecto_sql/lib/ecto/adapters/sql/application.ex

@@ -0,0 +1,14 @@
+defmodule Ecto.Adapters.SQL.Application do
+  @moduledoc false
+  use Application
+
+  def start(_type, _args) do
+    children = [
+      {DynamicSupervisor, strategy: :one_for_one, name: Ecto.MigratorSupervisor},
+      {Task.Supervisor, name: Ecto.Adapters.SQL.StorageSupervisor}
+    ]
+
+    opts = [strategy: :one_for_one, name: Ecto.Adapters.SQL.Supervisor]
+    Supervisor.start_link(children, opts)
+  end
+end