Fix request throttling

Requests to Chaturbate were not throttled properly

src/main/java/ctbrec/Model.java

@@ -266,6 +266,7 @@ public class Model {
             if(diff < 500) {
                 Thread.sleep(diff);
             }
+            lastRequest = now;
         }
 
         public MasterPlaylist getMasterPlaylist(String modelName) throws IOException, ParseException, PlaylistException, ExecutionException {