[soundcloud] Improve_VALID_URL

Add support for links from Audiomack

youtube_dl/extractor/soundcloud.py

@@ -32,7 +32,7 @@ class SoundcloudIE(InfoExtractor):
                             (?P<title>[\w\d-]+)/?
                             (?P<token>[^?]+?)?(?:[?].*)?$)
                        |(?:api\.soundcloud\.com/tracks/(?P<track_id>\d+)
-                          (?:/?\?secret_token=(?P<secret_token>[^&]+?))?$)
+                          (?:/?\?secret_token=(?P<secret_token>[^&]+))?)
                        |(?P<player>(?:w|player|p.)\.soundcloud\.com/player/?.*?url=.*)
                     )
                     '''