[duboku] Add new extractor www.duboku.co

youtube_dl/extractor/extractors.py

@@ -282,6 +282,7 @@
 )
 from .dtube import DTubeIE
 from .dvtv import DVTVIE
+from .duboku import DubokuIE
 from .dumpert import DumpertIE
 from .defense import DefenseGouvFrIE
 from .discovery import DiscoveryIE