Fix imports for python3

spotdl.py

@@ -8,12 +8,16 @@ from titlecase import titlecase
 from slugify import slugify
 import spotipy
 import spotipy.oauth2 as oauth2
-import urllib2
 import pafy
 import sys
 import os
 import subprocess
 
+try:
+    import urllib2
+except ImportError:
+    import urllib.request as urllib2
+
 def generate_songname(raw_song):
     if misc.is_spotify(raw_song):
         tags = generate_metadata(raw_song)