Please answer these questions before submitting your issue. Thanks!
在你提交 issue 前，请先回答以下问题，谢谢！

1. What version of Go and cronsun version are you using?
你用的是哪个版本的 Go 和 哪个版本的 cronsun？

2. What operating system and processor architecture are you using (`go env`)?
你用的是哪个操作系统，什么架构的？


3. What did you do?
If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
你做了什么，遇到了什么问题？尽可能描述清楚问题，最好把操作步骤写下来，按这些步骤操作后能重现你的问题。


4. What did you expect to see?
你期望得到什么样的结果？


5. What did you see instead?
现在你得到的结果是什么样的？
