Update min retry count to 3.

Empirical testing in shows increased robustness.

library/src/main/java/com/google/android/exoplayer/chunk/ChunkSampleSource.java

@@ -137,7 +137,7 @@ public class ChunkSampleSource implements SampleSource, Loader.Callback {
   /**
    * The default minimum number of times to retry loading data prior to failing.
    */
-  public static final int DEFAULT_MIN_LOADABLE_RETRY_COUNT = 1;
+  public static final int DEFAULT_MIN_LOADABLE_RETRY_COUNT = 3;
 
   private static final int STATE_UNPREPARED = 0;
   private static final int STATE_PREPARED = 1;