Change downloadSpeed to int (#59)

The downloadSpeed property stores the speed in bytes per second,
which will always be an integer. Yet, the value was being stored
as a float. This commit fixes this issue.

library/src/main/java/com/github/se_bastiaan/torrentstream/StreamStatus.java

@@ -20,12 +20,12 @@ public class StreamStatus {
     public final float progress;
     public final int bufferProgress;
     public final int seeds;
-    public final float downloadSpeed;
+    public final int downloadSpeed;
 
     StreamStatus(float progress, int bufferProgress, int seeds, int downloadSpeed) {
         this.progress = progress;
         this.bufferProgress = bufferProgress;
         this.seeds = seeds;
         this.downloadSpeed = downloadSpeed;
     }
-}
+}