Update preface.md

Add online mirror
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@ -26,6 +26,7 @@ Go语言圣经 [《The Go Programming Language》](http://gopl.io) 中文版本
- https://docs.hacknode.org/gopl-zh/
- https://books.studygolang.com/gopl-zh/
- https://wizardforcel.gitbooks.io/gopl-zh/
- https://book.itsfun.top/gopl-zh/ #每夜自动构建
{% include "./version.md" %}