Remove some unnecessary imports in mediafile.py
@@ -36,15 +36,11 @@ data from the tags. In turn ``MediaField`` uses a number of
from __future__ import division, absolute_import, print_function
import mutagen
-import mutagen.mp3
import mutagen.id3
-import mutagen.oggopus
-import mutagen.oggvorbis
import mutagen.mp4
import mutagen.flac
-import mutagen.monkeysaudio
import mutagen.asf
-import mutagen.aiff
+
import codecs
import datetime
import re
