Fix get_track_url not returning anything. Resolves #28

Author: morguldir

tests/test_api.py

@@ -143,12 +143,12 @@ def test_playlist_picture(session):
 
 def test_get_track_url(session):
     track = session.get_track(108043415)
-    session.get_track_url(track.id)
+    assert session.get_track_url(track.id) != None
 
 
 def test_get_video_url(session):
     video = session.get_video(108046194)
-    session.get_video_url(video.id)
+    assert session.get_video_url(video.id) != None
 
 
 def test_load_session(session):

tidalapi/__init__.py

@@ -244,7 +244,7 @@ def get_media_url(self, track_id):
         return r.json()['url']
 
     def get_track_url(self, track_id):
-        self.get_media_url(track_id)
+        return self.get_media_url(track_id)
 
     def get_video_url(self, video_id):
         params = {