README.md样例代码问题  #144

try {
    PushResult result = jpushClient.sendPush(payload);
    LOG.info("Got result - " + result);
    Thread.sleep(5000);
    // 请求结束后，调用 NettyHttpClient 中的 close 方法，否则进程不会退出。
    jpushClient.close();
} catch(InterruptedException e) {
    e.printStackTrace();
}

JPushClient jpushClient =null;
try {
	    jpushClient = new JPushClient(MASTER_SECRET, APP_KEY);
	    PushPayload payload = PushPayload.alertAll(alert);
	    PushResult result = jpushClient.sendPush(payload);
	    this.output("Get result :" + result);
	    Thread.sleep(5000);
	} catch (Exception e) {
			Log....
	} finally {
	     try {
		    jpushClient.close();
	       } catch (Exception e) {
		     Log....
	       }
}