Added logging statement to WriteProxy#flushCache()

src/main/java/envoy/client/net/WriteProxy.java

@@ -62,10 +62,11 @@ public class WriteProxy {
 	/**
 	 * Sends cached {@link Message}s and {@link MessageStatusChangeEvent}s to the
 	 * server.
-	 * 
+	 *
 	 * @since Envoy v0.3-alpha
 	 */
 	public void flushCache() {
+		logger.info("Sending cached messages and message status change events...");
 
 		// Send messages
 		localDb.getMessageCache().relay();