Update preface.md

Add online mirror
2021-02-19 09:19:57 +08:00 · 2021-02-19 09:19:57 +08:00 · 2e6ca31aa5
parent 24f585ddb6
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+++ b/preface.md
@ -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" %}