Finishing touches

Author: Linsss123

src/main/java/com/example/NtfyConnectionImpl.java

@@ -87,6 +87,7 @@ public void receiveMessage(Consumer<NtfyMessageDto> messageHandler) {
                             .forEach(messageHandler);
                 }).exceptionally(e -> {
                     System.err.println("Async connection error: " + e.getMessage());
+                    e.printStackTrace();
                     return null;
                 });
     }