[buzzfeed] Add new extractor (Fixes #4259)

youtube_dl/extractor/__init__.py

@@ -38,6 +38,7 @@ from .bpb import BpbIE
 from .br import BRIE
 from .breakcom import BreakIE
 from .brightcove import BrightcoveIE
+from .buzzfeed import BuzzFeedIE
 from .byutv import BYUtvIE
 from .c56 import C56IE
 from .canal13cl import Canal13clIE