Merge pull request #20 from Vaibhav2399/Vaibhav

Added required casting in VoiceAnnouncementManager

src/main/java/de/dennisguse/opentracks/services/announcement/VoiceAnnouncementManager.java

@@ -183,7 +183,7 @@ public void updateNextTaskDistance() {
             Distance distance = trackStatistics.getTotalDistance();
 
             int index = (int) (distance.dividedBy(distanceFrequency));
-            nextTotalDistance = distanceFrequency.multipliedBy(index + 1);
+            nextTotalDistance = distanceFrequency.multipliedBy((double) (index + 1));
         }
 
     }