Add logging output

Author: moxie0

src/main/java/org/whispersystems/bithub/storage/CacheManager.java

@@ -84,6 +84,7 @@ public void initializeUpdates(final CoinbaseClient coinbaseClient,
     executor.scheduleAtFixedRate(new Runnable() {
       @Override
       public void run() {
+        logger.warn("Running cache update...");
         try {
           CurrentPayment    currentPayment = createCurrentPaymentForBalance(coinbaseClient);
           List<Transaction> transactions   = createRecentTransactions      (coinbaseClient);