[mediaset] Add extractor

youtube_dl/extractor/extractors.py

@@ -545,6 +545,7 @@
 )
 from .matchtv import MatchTVIE
 from .mdr import MDRIE
+from .mediaset import MediasetIE
 from .medici import MediciIE
 from .meipai import MeipaiIE
 from .melonvod import MelonVODIE