fix:调整了无头浏览器的流程：需要手动调用关闭浏览器方法

fix:调整了下载文件判断，如果下载结束后文件不存在则抛异常

src/main/java/com/yutou/qqbot/QQBotApplication.java

@@ -6,7 +6,7 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 @SpringBootApplication
 public class QQBotApplication {
-    public static final String version="QQBot v.1.3";
+    public static final String version="QQBot v.1.3.1";
     public static void main(String[] args) {
         System.out.println("version = " + version);
         SpringApplication.run(QQBotApplication.class, args);