[dw] Add new extractor

youtube_dl/extractor/__init__.py

@@ -189,6 +189,7 @@ from .dumpert import DumpertIE
 from .defense import DefenseGouvFrIE
 from .discovery import DiscoveryIE
 from .dropbox import DropboxIE
+from .dw import DWIE
 from .eagleplatform import EaglePlatformIE
 from .ebaumsworld import EbaumsWorldIE
 from .echomsk import EchoMskIE