Merge pull request #63 from CloudnuY/master

Fix error
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Xargin 2018-06-13 16:35:00 +08:00 committed by GitHub
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@ -2,7 +2,7 @@
在本章我们会学到另一个标准的接口类型flag.Value是怎么帮助命令行标记定义新的符号的。思考下面这个会休眠特定时间的程序
<u></i>gopl.io/ch7/sleep</i></u>
<u><i>gopl.io/ch7/sleep</i></u>
```go
var period = flag.Duration("period", 1*time.Second, "sleep period")