rename bbccouk.py -> bbc.py

youtube_dl/extractor/__init__.py

@@ -35,7 +35,7 @@ from .azubu import AzubuIE
 from .baidu import BaiduVideoIE
 from .bambuser import BambuserIE, BambuserChannelIE
 from .bandcamp import BandcampIE, BandcampAlbumIE
-from .bbccouk import BBCCoUkIE, BBCNewsIE
+from .bbc import BBCCoUkIE, BBCNewsIE
 from .beeg import BeegIE
 from .behindkink import BehindKinkIE
 from .beatportpro import BeatportProIE