added method to retrieve heartbeats, needs to be tested

src/main/java/Main.java

@@ -1,9 +1,14 @@
 import manage.AuthFITBIT;
+import manage.FITBITData.HeartRate;
+import manage.FITBITData.Sleep;
 
 public class Main {
     public static void main(String[] args) throws Exception {
         AuthFITBIT fitbit = new AuthFITBIT();
 
-        fitbit.run("https://api.fitbit.com/1/user/-/activities/heart/date/today/1d.json");
+        HeartRate h = fitbit.run("https://api.fitbit.com/1/user/-/activities/heart/date/today/1d.json", HeartRate.class); // 1sec/time/00:00/00:01.json
+        Sleep s = fitbit.run("https://api.fitbit.com/1.2/user/-/sleep/date/today.json", Sleep.class);
+
+        System.out.println(h.dateTime + " " + h.average);
     }
 }