fix wrong spotify url

PlayBot/sites/spotify.pm

@@ -74,7 +74,7 @@ sub get {
     $infos{'title'} = $content->{'name'};
     $infos{'duration'} = $content->{'duration_ms'} / 1000;
 	$infos{'site'} = 'spotify';
-    $infos{'url'} = 'https://open.spotify/track/'.$id;
+    $infos{'url'} = 'https://open.spotify.com/track/'.$id;
     $infos{'author'} = $content->{'artists'}->[0]->{'name'};
 	$infos{'external_id'} = $id;