[soundcloud] use proxy env var

lib/sites/soundcloud.pm

@@ -11,7 +11,10 @@ my $clientId = 'f4956716fe1a9dc9c3725af822963365';
 sub get {
 	my ($url) = @_;
 
-	my $ua = LWP::UserAgent->new(timeout => 30);
+	my $ua = LWP::UserAgent->new(
+        timeout => 30
+        env_proxy   => 1,
+    );
 
 	my $response = $ua->get($root.'/resolve.json?url='.$url.'&client_id='.$clientId);
 	die($response->status_line) unless ($response->is_success);