bumped nav version (#570)

Author: Cameron Mace

mapbox/libandroid-telemetry/src/main/java/com/mapbox/services/android/telemetry/navigation/MapboxNavigationEvent.java

@@ -15,7 +15,7 @@
  */
 public class MapboxNavigationEvent {
 
-  private static final int EVENT_VERSION = 1;
+  private static final int EVENT_VERSION = 3;
 
   // Event types
   public static final String TYPE_TURNSTILE = "navigation.turnstile";