Patch for Github issue #524

Author: neelkanth-kaushik

analytics/src/main/java/com/segment/analytics/internal/AnalyticsClient.java

@@ -25,7 +25,7 @@
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
-import java.util.concurrent.Future;
+import java.util.concurrent.Future; 
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.RejectedExecutionException;
 import java.util.concurrent.ScheduledExecutorService;