Update index.md

chapter_preface/index.md

@@ -162,8 +162,8 @@ Hoa Nguyen, manuel-arno-korfmann-webentwicklung, aterzis-personal, nxby, Xiaotin
 mathresearch, mzz2017, jroberayalas, iluu, ghejc, BSharmi, vkramdev, simonwardjones, LakshKD,
 TalNeoran, djliden, Nikhil95, Oren Barkan, guoweis, haozhu233, pratikhack, 315930399, tayfununal,
 steinsag, charleybeller, Andrew Lumsdaine, Jiekui Zhang, Deepak Pathak, Florian Donhauser, Tim Gates,
-Adriaan Tijsseling, Ron Medina, Gaurav Saha, Murat Semerci, [Lei Mao](https://github.com/leimao), [Zhu Yuanxiang](https://zhuyuanxiang.github.io),
-[thebesttv](https://github.com/thebesttv/), Quanshangze Du，Yanbo Chen。
+Adriaan Tijsseling, Ron Medina, Gaurav Saha, Murat Semerci, Lei Mao, Zhu Yuanxiang,
+thebesttv, Quanshangze Du, Yanbo Chen。
 
 我们感谢Amazon Web Services，特别是Swami Sivasubramanian、Peter DeSantis、Adam Selipsky和Andrew Jassy对撰写本书的慷慨支持。如果没有可用的时间、资源、与同事的讨论和不断的鼓励，这本书就不会出版。