Temporarily fix Downloader.

src/main/java/moe/nekojimi/chords/Downloader.java

@@ -231,7 +231,7 @@ public class Downloader extends QueueThing<TrackRequest, Track>
         List<Track> ret = new ArrayList<>();
         try
         {
-            String cmd = Chords.getSettings().getYtdlCommand() + " --skip-download --write-info-json " + request.getUrl().toString();
+            String cmd = Chords.getSettings().getYtdlCommand() + " --skip-download --print-json " + request.getUrl().toString();
             Process exec = runCommand(cmd, INFO_TIMEOUT);
             InputStream input = exec.getInputStream();