Remove unused require (#716)

Author: sabiwara

lib/ecto/adapters/tds.ex

@@ -136,9 +136,6 @@ defmodule Ecto.Adapters.Tds do
   use Ecto.Adapters.SQL,
     driver: :tds
 
-  require Logger
-  require Ecto.Query
-
   @behaviour Ecto.Adapter.Storage
 
   @doc false

lib/ecto/adapters/tds/connection.ex

@@ -1,11 +1,9 @@
 if Code.ensure_loaded?(Tds) do
   defmodule Ecto.Adapters.Tds.Connection do
     @moduledoc false
-    require Logger
     alias Tds.Query
     alias Ecto.Query.Tagged
     alias Ecto.Adapters.SQL
-    require Ecto.Schema
 
     @behaviour Ecto.Adapters.SQL.Connection
 

lib/ecto/migrator.ex

@@ -104,7 +104,6 @@ defmodule Ecto.Migrator do
   """
 
   require Logger
-  require Ecto.Query
 
   alias Ecto.Migration.Runner
   alias Ecto.Migration.SchemaMigration